diff --git a/src/main/java/kroppeb/server/command/commands/EffectCommand.java b/src/main/java/kroppeb/server/command/commands/EffectCommand.java
new file mode 100644
index 0000000..b0b68cd
--- /dev/null
+++ b/src/main/java/kroppeb/server/command/commands/EffectCommand.java
@@ -0,0 +1,153 @@
+/*
+* Copyright (c) 2020 MadHau5
+* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+package kroppeb.server.command.commands;
+
+import kroppeb.server.command.Command;
+import kroppeb.server.command.arguments.Selector;
+import kroppeb.server.command.reader.Reader;
+import kroppeb.server.command.reader.ReaderException;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.effect.StatusEffect;
+import net.minecraft.entity.effect.StatusEffectInstance;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.util.registry.Registry;
+
+import java.util.Collection;
+
+abstract public class EffectCommand implements Command {
+	final Selector targets;
+	final StatusEffect effect;
+	
+	public static EffectCommand read(Reader reader) throws ReaderException {
+		String sub = reader.readLiteral();
+		switch (sub) {
+			case "give":
+				return GiveCommand.read(reader);
+			case "clear":
+				return ClearCommand.read(reader);
+			default:
+				throw new ReaderException("Unexpected effect literal: " + sub);
+		}
+		
+	}
+	
+	public static class GiveCommand extends EffectCommand {
+		final int duration;
+		final int amplifier;
+		final boolean hideParticles;
+		
+		public GiveCommand(Selector targets, StatusEffect effect, int duration, int amplifier, boolean hideParticles) {
+			this.targets = targets;
+			this.effect = effect;
+			this.duration = duration;
+			this.amplifier = amplifier;
+			this.hideParticles = hideParticles;
+		}
+		
+		public static GiveCommand read(Reader reader) throws ReaderException {
+			Selector targets = Selector.read(reader);
+			StatusEffect effect = Registry.STATUS_EFFECT.get(reader.readIdentifier());
+			int duration;
+			int amplifier = 0;
+			boolean hideParticles = false;
+			if (reader.hasNext()) {
+				reader.moveNext();
+				duration = reader.readInt();
+			} else {
+				duration = -1;
+			}
+			if (reader.hasNext()) {
+				reader.moveNext();
+				amplifier = reader.readInt();
+			}
+			if (reader.hasNext()) {
+				String bool = reader.readLiteral();
+				switch (bool) {
+					case "true":
+						hideParticles = true;
+						break;
+					case "false":
+						hideParticles = false;
+						break;
+					default:
+						throw new ReaderException("Unexpected boolean literal: " + bool);
+				}
+			}
+			return new GiveCommand(targets, effect, duration, amplifier, hideParticles);
+		}
+		
+		public int execute(ServerCommandSource source) {
+			int e = 0;
+			Collection<Entity> entities = targets.getEntities(source);
+			for (Entity entity : entities) {
+				if (entity instanceof LivingEntity) {
+					LivingEntity livingEntity = (LivingEntity) entity;
+					if (effect.isInstant()) {
+						if (duration == -1) {
+							duration = 1;
+						}
+					} else {
+						if (duration == -1) {
+							duration = 30;
+						}
+						duration *= 20;
+					}
+					livingEntity.addStatusEffect(new StatusEffectInstance(effect,
+							duration, amplifier, false, hideParticles));
+					e++;
+				}
+			}
+			if (e == 0) {
+				// TODO: throw error on failed command
+			}
+			return e;
+		}
+	}
+	
+	public static class ClearCommand extends EffectCommand {
+		
+		public ClearCommand(Selector targets, StatusEffect effect) {
+			this.targets = targets;
+			this.effect = null;
+		}
+		
+		public static ClearCommand read(Reader reader) throws ReaderException {
+			Selector targets = Selector.read(reader);
+			StatusEffect effect;
+			if (reader.hasNext()) {
+				effect = Registry.STATUS_EFFECT.get(reader.readIdentifier());
+			}
+			return new ClearCommand(targets, effect);
+		}
+		
+		public int execute(ServerCommandSource source) {
+			int e = 0;
+			Collection<Entity> entities = targets.getEntities(source);
+			if (effect == null) {
+				for (Entity entity : entities) {
+					if (entity instanceof LivingEntity) {
+						((LivingEntity) entity).clearStatusEffects();
+						e++;
+					}
+				}
+			} else {
+				for (Entity entity : entities) {
+					if (entity instanceof LivingEntity) {
+						((LivingEntity) entity).removeStatusEffect(effect);
+						e++;
+					}
+				}
+			}
+			if (e == 0) {
+				// TODO: throw error on failed command
+			}
+			return e;
+		}
+	}
+}
diff --git a/src/main/java/kroppeb/server/command/commands/GameModeCommand.java b/src/main/java/kroppeb/server/command/commands/GameModeCommand.java
new file mode 100644
index 0000000..d3e7e42
--- /dev/null
+++ b/src/main/java/kroppeb/server/command/commands/GameModeCommand.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2020 MadHau5
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package kroppeb.server.command.commands;
+
+import kroppeb.server.command.Command;
+import kroppeb.server.command.arguments.Selector;
+import kroppeb.server.command.reader.Reader;
+import kroppeb.server.command.reader.ReaderException;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.registry.Registry;
+import net.minecraft.world.GameMode;
+
+import java.util.Collection;
+
+abstract public class GameModeCommand implements Command {
+	final Selector targets;
+	final GameMode gm;
+
+	public GameModeCommand(Selector targets, GameMode gm) {
+		this.targets = targets;
+		this.gm = gm;
+	}
+
+	public static GameModeCommand read(Reader reader) throws ReaderException {
+		Selector targets = null;
+		GameMode gm = GameMode.byName(reader.readLiteral()); // TODO: handle custom gamemodes
+		if (reader.hasNext()) {
+			targets = Selector.read(reader);
+		}
+		return new GameModeCommand(targets, gm);
+	}
+
+	public int execute(ServerCommandSource source) {
+		int e = 0;
+		Collection<Entity> entities;
+		if (targets == null) {
+			entities = Collections.<Entity>singleton(source.getPlayer());
+		} else {
+			entities = targets.getEntities(source);
+		}
+		for (Entity entity : entities) {
+			if (entity instanceof PlayerEntity) {
+				((PlayerEntity) entity).setGameMode(gm);
+				e++;
+			}
+		}
+		if (e == 0) {
+			// TODO: throw error on failed command
+		}
+		return e;
+	}
+}
diff --git a/src/main/java/kroppeb/server/command/commands/GiveCommand.java b/src/main/java/kroppeb/server/command/commands/GiveCommand.java
new file mode 100644
index 0000000..86e9ac0
--- /dev/null
+++ b/src/main/java/kroppeb/server/command/commands/GiveCommand.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2020 MadHau5
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package kroppeb.server.command.commands;
+
+import kroppeb.server.command.Command;
+import kroppeb.server.command.arguments.Selector;
+import kroppeb.server.command.reader.Reader;
+import kroppeb.server.command.reader.ReaderException;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.registry.Registry;
+
+import java.util.Collection;
+
+abstract public class GiveCommand implements Command {
+	final Selector targets;
+	final Identifier item;
+	final CompoundTag nbt;
+	final int count;
+
+	public GiveCommand(Selector targets, Identifier item, CompoundTag nbt, int count) {
+		this.targets = targets;
+		this.item = item;
+		this.nbt = nbt;
+		this.count = count;
+	}
+
+	public static GiveCommand read(Reader reader) throws ReaderException {
+		Selector targets = Selector.read(reader);
+		Identifier item = Registry.ITEM.get(reader.readIdentifier());
+		CompoundTag nbt;
+		int count = 1;
+		if (reader.hasNext()) {
+			// nbt = ???;
+			// TODO: Process NBT tags
+		}
+		if (reader.hasNext()) {
+			reader.moveNext();
+			count = reader.readInt();
+		}
+		return new GiveCommand(targets, item, nbt, count);
+	}
+
+	public int execute(ServerCommandSource source) {
+		int e = 0;
+		
+		int stackMax = item.getMaxCount();
+		int stackCount = count / stackMax;
+		ItemStack stack = ItemStack(item, stackMax);
+		// TODO: throw error for 'illegal' item (not found)
+		
+		Collection<Entity> entities = targets.getEntities(source);
+		for (Entity entity : entities) {
+			if (entity instanceof PlayerEntity) {
+				player = (PlayerEntity) entity;
+				for (int i = 0; i < stackCount + 1; i++) {
+					if (i == stackCount) {
+						stack.setCount(count % stackMax);
+					}
+					ItemEntity itemEntity = player.dropItem(stack, false);
+					if (itemEntity != null) {
+						itemEntity.setOwner(player);
+						itemEntity.resetPickupDelay();
+					} else {
+						i--;
+					}
+				}
+				e++;
+			}
+		}
+		if (e == 0) {
+			// TODO: throw error on failed command
+		}
+		return e;
+	}
+}