diff --git a/cambios.md b/cambios.md
index caf3b6a..8aada33 100644
--- a/cambios.md
+++ b/cambios.md
@@ -1,4 +1,4 @@
-# v3.9
+# v4.0
 
 ## novedades
 
@@ -6,12 +6,12 @@
 
 #### módulos nuevos:
 
-- escaleras veloces: sube escaleras más rápido
-- parkour: salta automáticamente
-- confetti: cambia el color de las partículas del pop del tótem
+- aura de cristales: hace cpvp por ti (muy mejorable, estoy en ello)
 
 ### arreglos / mejoras
 
+- `$echest` ya funciona y tal
+
 ## problemas reconocidos
 
 - lo de siempre
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index f1ace47..a9564b0 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -10,6 +10,6 @@ fabric_api_version=0.140.2+1.21.11
 
 neutrino_version=1.1.0
 
-mod_version=3.9
+mod_version=4.0
 maven_group=me.retucio
 archives_base_name=sputnik
\ No newline at end of file
diff --git a/src/main/java/me/retucio/sputnik/Sputnik.java b/src/main/java/me/retucio/sputnik/Sputnik.java
index 255fd4a..7511101 100644
--- a/src/main/java/me/retucio/sputnik/Sputnik.java
+++ b/src/main/java/me/retucio/sputnik/Sputnik.java
@@ -96,6 +96,8 @@ public class Sputnik implements ClientModInitializer {
         EVENT_BUS.subscribe(NetworkUtil.class);
         EVENT_BUS.subscribe(RenderUtil.class);
 
+        EVENT_BUS.subscribe(BlockIterator.class);
+
         Lists.init();
         Textures.init();
 
diff --git a/src/main/java/me/retucio/sputnik/module/ModuleManager.java b/src/main/java/me/retucio/sputnik/module/ModuleManager.java
index e5f2895..88264e4 100644
--- a/src/main/java/me/retucio/sputnik/module/ModuleManager.java
+++ b/src/main/java/me/retucio/sputnik/module/ModuleManager.java
@@ -5,10 +5,7 @@ import me.retucio.sputnik.Sputnik;
 import me.retucio.sputnik.module.modules.client.DiscordRPC;
 import me.retucio.sputnik.module.modules.client.HUD;
 import me.retucio.sputnik.module.modules.camera.*;
-import me.retucio.sputnik.module.modules.combat.AttributeSwapper;
-import me.retucio.sputnik.module.modules.combat.MaceKill;
-import me.retucio.sputnik.module.modules.combat.ProjectileTrajectories;
-import me.retucio.sputnik.module.modules.combat.SpearKill;
+import me.retucio.sputnik.module.modules.combat.*;
 import me.retucio.sputnik.module.modules.inventory.*;
 import me.retucio.sputnik.module.modules.misc.*;
 import me.retucio.sputnik.module.modules.movement.*;
@@ -40,6 +37,7 @@ public class ModuleManager {
         // añadir los módulos
         addCamera();
         addClient();
+        addCombat();
         addInventory();
         addMisc();
         addMovement();
@@ -67,7 +65,6 @@ public class ModuleManager {
 
 
 
-
     private void addCamera() {
         add(new Autism());
         add(new Freecam());
@@ -83,6 +80,14 @@ public class ModuleManager {
         add(new HUD());
     }
 
+    private void addCombat() {
+        add(new AttributeSwapper());
+        add(new CrystalAura());
+        add(new MaceKill());
+        add(new ProjectileTrajectories());
+        add(new SpearKill());
+    }
+
     private void addMisc() {
         add(new AntiInvis());
         add(new AnvilFont());
@@ -138,15 +143,12 @@ public class ModuleManager {
     private void addPlayer() {
         add(new AirPlace());
         add(new AntiHunger());
-        add(new AttributeSwapper());
         add(new AutoFish());
         add(new Capes());
         add(new FastUse());
         add(new HandView());
         add(new KeyPearl());
-        add(new MaceKill());
         add(new NoFall());
-        add(new SpearKill());
         add(new WarnLowDurability());
     }
 
@@ -175,7 +177,6 @@ public class ModuleManager {
         add(new ColoredSigns());
         add(new LightOverlay());
         add(new NoMiningInterruptions());
-        add(new ProjectileTrajectories());
         add(new Racist());
         add(new StrongholdTriangulator());
         add(new TimeChanger());
diff --git a/src/main/java/me/retucio/sputnik/module/modules/combat/CrystalAura.java b/src/main/java/me/retucio/sputnik/module/modules/combat/CrystalAura.java
new file mode 100644
index 0000000..8c317f4
--- /dev/null
+++ b/src/main/java/me/retucio/sputnik/module/modules/combat/CrystalAura.java
@@ -0,0 +1,295 @@
+package me.retucio.sputnik.module.modules.combat;
+
+import com.github.retucio.neutrino.EventListener;
+import me.retucio.sputnik.event.render.Render3DEvent;
+import me.retucio.sputnik.module.Category;
+import me.retucio.sputnik.module.Module;
+import me.retucio.sputnik.module.setting.SettingGroup;
+import me.retucio.sputnik.module.setting.settings.BooleanSetting;
+import me.retucio.sputnik.module.setting.settings.ColorSetting;
+import me.retucio.sputnik.module.setting.settings.ListSetting;
+import me.retucio.sputnik.module.setting.settings.NumberSetting;
+import me.retucio.sputnik.util.*;
+import me.retucio.sputnik.util.render.RenderUtil;
+import net.minecraft.block.Blocks;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.decoration.EndCrystalEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.item.Items;
+import net.minecraft.network.packet.c2s.play.PlayerInteractBlockC2SPacket;
+import net.minecraft.util.Hand;
+import net.minecraft.util.hit.BlockHitResult;
+import net.minecraft.util.hit.HitResult;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
+import net.minecraft.util.math.Vec3d;
+import net.minecraft.world.RaycastContext;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author retucio
+ */
+public class CrystalAura extends Module {
+
+    private final SettingGroup sgPlace = addSg(new SettingGroup("colocar", false));
+    private final SettingGroup sgBreak = addSg(new SettingGroup("reventar", false));
+    private final SettingGroup sgRender = addSg(new SettingGroup("renderizado", false));
+
+    private final ListSetting<EntityType<?>> entities = sgGeneral.add(new ListSetting<>(
+            "entidades", "entidades a las que atacar",
+            Lists.entityList, Lists.allFalseExcept(Lists.entityList, EntityType.PLAYER), Lists.entityNames
+    ));
+
+    private final NumberSetting targetRange = sgGeneral.add(new NumberSetting(
+            "rango",
+            "rango de detección de blancos",
+            5, 0, 12, 0.1
+    ));
+
+
+    // ajustes al colocar los cristales
+
+    private final BooleanSetting placeCrystals = sgPlace.add(new BooleanSetting(
+            "colocar", "colocar los cristales", true
+    ));
+
+    private final NumberSetting placeDelay = sgPlace.add(new NumberSetting(
+            "delay", "delay entre cristal y cristal",
+            0, 0, 20, 1
+    )).visibility(placeCrystals::getValue);
+
+    private final NumberSetting placeRange = sgPlace.add(new NumberSetting(
+            "rango ", "rango máximo para colocar cristales",
+            4.5, 0, 6, 0.1
+    )).visibility(placeCrystals::getValue);
+
+    private final BooleanSetting rotateToPlace = sgPlace.add(new BooleanSetting(
+            "rotar", "rotar para colocar cristales", false
+    )).visibility(placeCrystals::getValue);
+
+    private final BooleanSetting autoSelect = sgPlace.add(new BooleanSetting(
+            "autoseleccionar", "seleccionar cristales automáticamente", true
+    ));
+
+
+    // ajustes al reventar los cristales
+
+    private final BooleanSetting breakCrystals = sgBreak.add(new BooleanSetting(
+            "reventar", "reventar los cristales", true
+    ));
+
+    private final NumberSetting breakDelay = sgBreak.add(new NumberSetting(
+            "delay ", "delay entre cristal y cristal",
+            0, 0, 20, 1
+    )).visibility(breakCrystals::getValue);
+
+    private final BooleanSetting rotateToBreak = sgBreak.add(new BooleanSetting(
+            "rotar", "rotar para reventar cristales", false
+    )).visibility(breakCrystals::getValue);
+
+
+    // ajustes de renderizado
+
+    private final BooleanSetting outlines = sgRender.add(new BooleanSetting(
+            "contorno", "renderizar contorno del bloque donde se colocan los cristales", true
+    ));
+
+    private final ColorSetting outlineColor = sgRender.add(new ColorSetting(
+            "color del contorno", "color del contorno",
+            Colors.mainColor, false
+    )).visibility(outlines::getValue);
+
+    private final NumberSetting outlineWidth = sgRender.add(new NumberSetting(
+            "grosor del contorno", "grosor del contorno",
+            2, 0, 15, 0.1
+    )).visibility(outlines::getValue);
+
+    private final BooleanSetting fillings = sgRender.add(new BooleanSetting(
+            "relleno", "renderizar relleno del bloque donde se colocan los cristales", false
+    ));
+
+    private final ColorSetting fillingColor = sgRender.add(new ColorSetting(
+            "color del relleno", "color del relleno",
+            Colors.withAlpha(Colors.mainColor, 70), false
+    )).visibility(fillings::getValue);
+
+
+    private final List<LivingEntity> targets = new ArrayList<>();
+    private BlockPos bp = null;
+
+    private int placeTimer = placeDelay.getIntValue();
+    private int breakTimer = breakDelay.getIntValue();
+
+
+    public CrystalAura() {
+        super("aura de cristales",
+                "coloca y revienta cristales del end por ti", Category.COMBAT);
+    }
+
+
+    @Override
+    public void onTick() {
+        if (mc.player == null || mc.interactionManager == null || mc.world == null || mc.getCameraEntity() == null) return;
+
+        if (placeTimer > 0) placeTimer--;
+        if (breakTimer > 0) breakTimer--;
+
+        findTargets();
+
+        if (!targets.isEmpty()) {
+            if (placeCrystals.getValue()) doPlace();
+            if (breakCrystals.getValue()) doBreak();
+        } else {
+            bp = null;
+        }
+    }
+
+    // colocar cristal
+    private void doPlace() {
+        if (placeTimer > 0) return;
+
+        if (!canPlaceCrystal()) {
+            bp = null;
+            return;
+        }
+
+        // elegir como blanco primario la entidad más cercana
+        LivingEntity primaryTarget = null;
+        double closestTargetDist = Double.MAX_VALUE;
+        for (LivingEntity target : targets) {
+            double dist = mc.player.squaredDistanceTo(target);
+            if (dist < closestTargetDist) {
+                closestTargetDist = dist;
+                primaryTarget = target;
+            }
+        }
+        if (primaryTarget == null) {
+            bp = null;
+            return;
+        }
+
+        final Vec3d targetPos = primaryTarget.getEntityPos();
+        final BlockPos.Mutable[] bestPos = new BlockPos.Mutable[1];
+        final double[] bestDist = { Double.MAX_VALUE };
+
+        BlockIterator.register((int) Math.ceil(placeRange.getValue()), (int) Math.ceil(placeRange.getValue()), (pos, state) -> {
+            if (!state.isOf(Blocks.OBSIDIAN) && !state.isOf(Blocks.BEDROCK)) return;
+            if (!mc.world.isAir(pos.add(0, 1, 0))) return;
+
+            // cálculo de mejor distancia
+            double dist = targetPos.squaredDistanceTo(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5);
+            if (dist < bestDist[0]) {
+                bestDist[0] = dist;
+                if (bestPos[0] == null) bestPos[0] = new BlockPos.Mutable();
+                bestPos[0].set(pos);
+            }
+        });
+
+        BlockIterator.after(() -> {
+            if (bestPos[0] != null) {
+                BlockHitResult result = getBlockInfo(bestPos[0]);
+                placeCrystal(result);
+                bp = bestPos[0].toImmutable();  // guardar para el renderizado
+            } else {
+                bp = null;
+            }
+        });
+
+        placeTimer = placeDelay.getIntValue();
+    }
+
+    private void doBreak() {
+        if (breakTimer > 0) return;
+        for (Entity entity : mc.world.getEntities()) {
+            if (!(entity instanceof EndCrystalEntity) || entity.distanceTo(mc.player) > mc.player.getEntityInteractionRange()) continue;
+            if (rotateToBreak.getValue()) EntityUtil.lookAt(entity.getEyePos());
+            mc.interactionManager.attackEntity(mc.player, entity);
+        }
+        breakTimer = breakDelay.getIntValue();
+    }
+
+    private void placeCrystal(BlockHitResult result) {
+        if (autoSelect.getValue()) {
+            int slot = InventoryUtil.findSlot(stack -> stack.isOf(Items.END_CRYSTAL));
+            if (slot != InventoryUtil.OFFHAND_SLOT) {
+                if (!PlayerInventory.isValidHotbarIndex(slot)) {
+                    InventoryUtil.swapWithHotbar(slot, mc.player.getInventory().getSelectedSlot());
+                } else {
+                    mc.player.getInventory().setSelectedSlot(slot);
+                }
+            }
+        }
+
+        Hand hand;
+        if (mc.player.getMainHandStack().isOf(Items.END_CRYSTAL)) {
+            hand = Hand.MAIN_HAND;
+        } else if (mc.player.getOffHandStack().isOf(Items.END_CRYSTAL)) {
+            hand = Hand.OFF_HAND;
+        } else {
+            return;
+        }
+
+        if (rotateToPlace.getValue()) EntityUtil.lookAt(result.getBlockPos().toCenterPos());
+        mc.interactionManager.sendSequencedPacket(mc.world, (sequence) -> new PlayerInteractBlockC2SPacket(hand, result, sequence));
+    }
+
+    // encontrar blancos
+    private void findTargets() {
+        targets.clear();
+        for (Entity e : mc.world.getEntities()) {
+            if (!(e instanceof LivingEntity entity)) continue;
+            if (!entity.isAlive() || entity.isInCreativeMode() || entity.equals(mc.player)) continue;
+            if (!entities.isEnabled(entity.getType())) continue;
+            if (entity.squaredDistanceTo(mc.player) > targetRange.getValue() * targetRange.getValue()) continue;
+            targets.add(entity);
+        }
+    }
+
+    private BlockHitResult getBlockInfo(BlockPos pos) {
+        Vec3d start = new Vec3d(mc.player.getX(), mc.player.getY() + mc.player.getEyeHeight(mc.player.getPose()), mc.player.getZ());
+        Vec3d end;
+
+        for (Direction side : Direction.values()) {
+            end = new Vec3d(
+                    pos.getX() + 0.5 + side.getVector().getX() * 0.5,
+                    pos.getY() + 0.5 + side.getVector().getY() * 0.5,
+                    pos.getZ() + 0.5 + side.getVector().getZ() * 0.5
+            );
+
+            BlockHitResult result = mc.world.raycast(new RaycastContext(
+                    start, end, RaycastContext.ShapeType.COLLIDER, RaycastContext.FluidHandling.NONE, mc.player
+            ));
+
+            if (result != null && result.getType() == HitResult.Type.BLOCK && result.getBlockPos().equals(pos)) {
+                return result;
+            }
+        }
+
+        Direction side = pos.getY() > start.y ? Direction.DOWN : Direction.UP;
+        return new BlockHitResult(start, side, pos, false);
+    }
+
+    private boolean canPlaceCrystal() {
+        if (autoSelect.getValue()) {
+            return InventoryUtil.findSlot(stack -> stack.isOf(Items.END_CRYSTAL)) != -1;
+        } else {
+            return InventoryUtil.hasInHotbar(Items.END_CRYSTAL);
+        }
+    }
+
+    @EventListener
+    private void onRenderWorld(Render3DEvent event) {
+        if (bp != null) {
+            if (outlines.getValue()) {
+                RenderUtil.drawBlockOutline(event.getMatrices(), bp, outlineColor.getValue(), outlineWidth.getFloatValue(), false);
+            }
+            if (fillings.getValue()) {
+                RenderUtil.drawBlockFilled(event.getMatrices(), bp, fillingColor.getValue(), false);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/me/retucio/sputnik/module/modules/player/AutoFish.java b/src/main/java/me/retucio/sputnik/module/modules/player/AutoFish.java
index 70ef0e3..eafc628 100644
--- a/src/main/java/me/retucio/sputnik/module/modules/player/AutoFish.java
+++ b/src/main/java/me/retucio/sputnik/module/modules/player/AutoFish.java
@@ -52,7 +52,7 @@ public class AutoFish extends Module {
             0,
             64,
             1
-    ));
+    )).visibility(onlyRecastIfLookingAtWater::getValue);
 
     private final BooleanSetting dontBreak = sgGeneral.add(new BooleanSetting(
             "evitar romper",
@@ -71,8 +71,6 @@ public class AutoFish extends Module {
             onlyRecastIfLookingAtWater.visibility(v);
             recastRaycastDistance.visibility(v);
         });
-
-        onlyRecastIfLookingAtWater.onUpdate(v -> recastRaycastDistance.visibility(v));
     }
 
     @Override
diff --git a/src/main/java/me/retucio/sputnik/util/BlockIterator.java b/src/main/java/me/retucio/sputnik/util/BlockIterator.java
new file mode 100644
index 0000000..445cd62
--- /dev/null
+++ b/src/main/java/me/retucio/sputnik/util/BlockIterator.java
@@ -0,0 +1,102 @@
+/*
+ * This file is part of the Meteor Client distribution (https://github.com/MeteorDevelopment/meteor-client).
+ * Copyright (c) Meteor Development.
+ */
+
+package me.retucio.sputnik.util;
+
+import com.github.retucio.neutrino.EventListener;
+import it.unimi.dsi.fastutil.objects.ReferenceArrayList;
+import me.retucio.sputnik.Sputnik;
+import me.retucio.sputnik.event.TickEvent;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.util.math.BlockPos;
+
+import java.util.List;
+import java.util.function.BiConsumer;
+
+// https://github.com/MeteorDevelopment/meteor-client/blob/master/src/main/java/meteordevelopment/meteorclient/utils/world/BlockIterator.java
+public class BlockIterator {
+
+    private static final Pool<Callback> callbackPool = new Pool<>(Callback::new);
+    private static final List<Callback> callbacks = new ReferenceArrayList<>();
+
+    private static final List<Runnable> afterCallbacks = new ReferenceArrayList<>();
+
+    private static final BlockPos.Mutable blockPos = new BlockPos.Mutable();
+    private static int hRadius, vRadius;
+
+    private static boolean disableCurrent;
+
+    private BlockIterator() {}
+
+    @EventListener()
+    private static void onTick(TickEvent.Pre event) {
+        MinecraftClient mc = MinecraftClient.getInstance();
+        if (mc.player == null) return;
+
+        int px = mc.player.getBlockX();
+        int py = mc.player.getBlockY();
+        int pz = mc.player.getBlockZ();
+
+        for (int x = px - hRadius; x <= px + hRadius; x++) {
+            for (int z = pz - hRadius; z <= pz + hRadius; z++) {
+                for (int y = Math.max(mc.world.getBottomY(), py - vRadius); y <= py + vRadius; y++) {
+                    if (y > mc.world.getHeight()) break;
+
+                    blockPos.set(x, y, z);
+                    BlockState blockState = mc.world.getBlockState(blockPos);
+
+                    int dx = Math.abs(x - px);
+                    int dy = Math.abs(y - py);
+                    int dz = Math.abs(z - pz);
+
+                    callbacks.removeIf(callback -> {
+                        if (dx <= callback.hRadius && dy <= callback.vRadius && dz <= callback.hRadius) {
+                            disableCurrent = false;
+                            callback.function.accept(blockPos, blockState);
+                            return disableCurrent;
+                        }
+                        return false;
+                    });
+                }
+            }
+        }
+
+        hRadius = 0;
+        vRadius = 0;
+
+        callbackPool.freeAll(callbacks);
+        callbacks.clear();
+
+        for (Runnable callback : afterCallbacks) callback.run();
+        afterCallbacks.clear();
+    }
+
+    public static void register(int horizontalRadius, int verticalRadius, BiConsumer<BlockPos, BlockState> function) {
+        hRadius = Math.max(hRadius, horizontalRadius);
+        vRadius = Math.max(vRadius, verticalRadius);
+
+        Callback callback = callbackPool.get();
+
+        callback.function = function;
+        callback.hRadius = horizontalRadius;
+        callback.vRadius = verticalRadius;
+
+        callbacks.add(callback);
+    }
+
+    public static void disableCurrent() {
+        disableCurrent = true;
+    }
+
+    public static void after(Runnable callback) {
+        afterCallbacks.add(callback);
+    }
+
+    private static class Callback {
+        public BiConsumer<BlockPos, BlockState> function;
+        public int hRadius, vRadius;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/me/retucio/sputnik/util/InventoryUtil.java b/src/main/java/me/retucio/sputnik/util/InventoryUtil.java
index 740a40c..0fe57b2 100644
--- a/src/main/java/me/retucio/sputnik/util/InventoryUtil.java
+++ b/src/main/java/me/retucio/sputnik/util/InventoryUtil.java
@@ -1,5 +1,7 @@
 package me.retucio.sputnik.util;
 
+import com.github.retucio.neutrino.EventListener;
+import com.google.common.eventbus.Subscribe;
 import me.retucio.sputnik.event.network.DisconnectEvent;
 import me.retucio.sputnik.event.interact.OpenScreenEvent;
 import net.minecraft.client.gui.screen.ingame.GenericContainerScreen;
@@ -332,6 +334,18 @@ public class InventoryUtil {
         return -1;
     }
 
+    public static boolean hasInHotbar(Item item) {
+        List<ItemStack> stacks = findAll(stack -> stack.isOf(item));
+        for (ItemStack stack : stacks) {
+            int slot = mc.player.getInventory().getSlotWithStack(stack);
+            if (slot < HOTBAR_END || slot == OFFHAND_SLOT) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @EventListener
     public static void onOpenScreen(OpenScreenEvent event) {
         if (mc.player == null
                 || event.getScreen() == null
@@ -343,6 +357,7 @@ public class InventoryUtil {
             echestInv = handler.getInventory();
     }
 
+    @EventListener
     public void onDisconnect(DisconnectEvent event) {
         echestInv = null;
     }
diff --git a/src/main/java/me/retucio/sputnik/util/Lists.java b/src/main/java/me/retucio/sputnik/util/Lists.java
index 6edeadb..3a0b145 100644
--- a/src/main/java/me/retucio/sputnik/util/Lists.java
+++ b/src/main/java/me/retucio/sputnik/util/Lists.java
@@ -87,12 +87,26 @@ public class Lists {
         return map;
     }
 
+    @SafeVarargs
+    public static <T> Map<T, Boolean> allTrueExcept(List<T> options, T... exceptions) {
+        Map<T, Boolean> map = allFalse(options);
+        for (T exception : exceptions) map.replace(exception, false);
+        return map;
+    }
+
     public static <T> Map<T, Boolean> allFalse(List<T> options) {
         Map<T, Boolean> map = new HashMap<>();
         for (T option : options) map.put(option, false);
         return map;
     }
 
+    @SafeVarargs
+    public static <T> Map<T, Boolean> allFalseExcept(List<T> options, T... exceptions) {
+        Map<T, Boolean> map = allFalse(options);
+        for (T exception : exceptions) map.replace(exception, true);
+        return map;
+    }
+
     public static <T> Map<T, String> getMapOfLists(List<T> options, List<String> names) {
         Map<T, String> result = new HashMap<>();
 
diff --git a/src/main/java/me/retucio/sputnik/util/Pool.java b/src/main/java/me/retucio/sputnik/util/Pool.java
new file mode 100644
index 0000000..fe3cf83
--- /dev/null
+++ b/src/main/java/me/retucio/sputnik/util/Pool.java
@@ -0,0 +1,34 @@
+package me.retucio.sputnik.util;
+
+import java.util.ArrayDeque;
+import java.util.Collection;
+import java.util.Queue;
+import java.util.function.Supplier;
+
+// https://github.com/MeteorDevelopment/meteor-client/blob/master/src/main/java/meteordevelopment/meteorclient/utils/misc/Pool.java
+public final class Pool<T> {
+
+    private final Queue<T> items = new ArrayDeque<>();
+    private final Supplier<T> producer;
+
+    public Pool(Supplier<T> producer) {
+        this.producer = producer;
+    }
+
+    public synchronized T get() {
+        if (!items.isEmpty()) return items.poll();
+        return producer.get();
+    }
+
+    public synchronized void free(T obj) {
+        items.offer(obj);
+    }
+
+    public synchronized void freeAll(Iterable<T> objects) {
+        if (objects instanceof Collection<T> collection) {
+            items.addAll(collection);
+        } else {
+            objects.forEach(items::add);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/me/retucio/sputnik/util/render/RenderUtil.java b/src/main/java/me/retucio/sputnik/util/render/RenderUtil.java
index 9f6e3cd..b848ee8 100644
--- a/src/main/java/me/retucio/sputnik/util/render/RenderUtil.java
+++ b/src/main/java/me/retucio/sputnik/util/render/RenderUtil.java
@@ -94,6 +94,7 @@ public class RenderUtil {
     }
 
     public static void drawBlockFaceOutlines(MatrixStack matrices, BlockPos pos, Direction face, Color color, float lineWidth, boolean cull) {
+        if (lineWidth <= 0) return;
         Vec3d cameraPos = mc.gameRenderer.getCamera().getCameraPos();
 
         float minX = (float) (pos.getX() - cameraPos.x);
@@ -295,6 +296,7 @@ public class RenderUtil {
     // cajas
 
     public static void drawOutlineBox(MatrixStack matrices, Box box, Color color, float lineWidth, boolean cull) {
+        if (lineWidth <= 0) return;
         Vec3d cameraPos = mc.gameRenderer.getCamera().getCameraPos();
 
         float minX = (float) (box.minX - cameraPos.x);