diff --git a/SpigotCore_Main/src/de/steamwar/command/Argument.java b/SpigotCore_Main/src/de/steamwar/command/Argument.java
new file mode 100644
index 0000000..635b868
--- /dev/null
+++ b/SpigotCore_Main/src/de/steamwar/command/Argument.java
@@ -0,0 +1,120 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+import de.steamwar.sql.SteamwarUser;
+import org.bukkit.Bukkit;
+import org.bukkit.GameMode;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.*;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+
+public class Argument<T> {
+
+    private static final Set<Class<?>> numbers = new HashSet<>();
+    static {
+        numbers.add(Integer.class);
+        numbers.add(Long.class);
+        numbers.add(Double.class);
+        numbers.add(Float.class);
+    }
+
+    public static final Argument<Integer> INT = new Argument<>(Integer::parseInt, integer -> true);
+    public static final Argument<Double> DOUBLE = new Argument<>(Double::parseDouble, d -> true);
+    public static final Argument<String> STRING = new Argument<>(s -> s, string -> true);
+
+    public static final Argument<Player> PLAYER = new Argument<>(Bukkit::getPlayer, Objects::nonNull, () -> Bukkit.getOnlinePlayers().stream().map(Player::getName).toArray(String[]::new));
+    public static final Argument<GameMode> GAMEMODE = new Argument<>(s -> {
+        switch (s.toLowerCase()) {
+            case "creative": case "c": case "1":
+                return GameMode.CREATIVE;
+            case "survival": case "s": case "0":
+                return GameMode.SURVIVAL;
+            case "spectator": case "sp": case "3":
+                return GameMode.SPECTATOR;
+            case "adventure": case "a": case "2":
+                return GameMode.ADVENTURE;
+        }
+        return null;
+    }, Objects::nonNull, GameMode.class);
+    public static final Argument<SteamwarUser> USER = new Argument<>(SteamwarUser::get, Objects::nonNull, PLAYER.tabCompletes);
+
+    private BiFunction<String, CommandSender, T> mapper;
+    private Predicate<T> constraint;
+    private Function<String, String[]> tabCompletes;
+
+    public Argument(Function<String, T> mapper, Predicate<T> constraint, String... tabCompletes) {
+        this((s, player) -> mapper.apply(s), constraint, s -> tabCompletes);
+    }
+
+    public Argument(Function<String, T> mapper, Predicate<T> constraint, Class<? extends Enum<?>> tabCompletes) {
+        this((s, player) -> mapper.apply(s), constraint, s -> Arrays.stream(tabCompletes.getEnumConstants()).map(e -> e.name().toLowerCase()).toArray(String[]::new));
+    }
+
+    public Argument(Function<String, T> mapper, Predicate<T> constraint, Supplier<String[]> tabCompletes) {
+        this((s, player) -> mapper.apply(s), constraint, s -> tabCompletes.get());
+    }
+
+    public Argument(Function<String, T> mapper, Predicate<T> constraint, Function<String, String[]> tabCompletes) {
+        this((s, player) -> mapper.apply(s), constraint, tabCompletes);
+    }
+
+    public Argument(BiFunction<String, CommandSender, T> mapper, Predicate<T> constraint, Function<String, String[]> tabCompletes) {
+        this.mapper = mapper;
+        this.constraint = constraint;
+        this.tabCompletes = tabCompletes;
+    }
+
+    public Optional<T> valueSupplier(String s, CommandSender sender) {
+        try {
+            T argumentMapped = mapper.apply(s, sender);
+            if (constraint.test(argumentMapped)) return Optional.ofNullable(argumentMapped);
+        } catch (Exception e) {
+            // Ignored
+        }
+        return Optional.empty();
+    }
+
+    public Optional<List<String>> tabCompleteSupplier(String s, CommandSender sender) {
+        try {
+            if (!s.isEmpty()) {
+                // Check if mappable
+                T argumentMapped = mapper.apply(s, sender);
+                // Check number constraints if needed
+                if (numbers.contains(argumentMapped.getClass()) && !constraint.test(argumentMapped)) return Optional.empty();
+            }
+        } catch (Exception e) {
+            // Ignored
+        }
+        try {
+            return Optional.of(Arrays.stream(tabCompletes.apply(s)).filter(t -> t.startsWith(s)).collect(Collectors.toList()));
+        } catch (Exception e) {
+            return Optional.empty();
+        }
+    }
+
+}
diff --git a/SpigotCore_Main/src/de/steamwar/command/ArgumentMap.java b/SpigotCore_Main/src/de/steamwar/command/ArgumentMap.java
new file mode 100644
index 0000000..5db8a44
--- /dev/null
+++ b/SpigotCore_Main/src/de/steamwar/command/ArgumentMap.java
@@ -0,0 +1,47 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>
+ */
+
+package de.steamwar.command;
+
+import java.util.Arrays;
+import java.util.stream.Collectors;
+
+public class ArgumentMap {
+
+    private Object[] objects;
+
+    public ArgumentMap(Object[] objects) {
+        this.objects = objects;
+    }
+
+    public int length() {
+        return objects.length;
+    }
+
+    public <T> T get(int index) {
+        return (T)objects[index];
+    }
+
+    @Override
+    public String toString() {
+        return "ArgumentMap{" + Arrays.stream(objects).map(o -> o.getClass().getSimpleName() + "=" + o.toString()).collect(Collectors.joining(",")) + "}";
+    }
+
+}
diff --git a/SpigotCore_Main/src/de/steamwar/command/ArgumentUtils.java b/SpigotCore_Main/src/de/steamwar/command/ArgumentUtils.java
new file mode 100644
index 0000000..afd763d
--- /dev/null
+++ b/SpigotCore_Main/src/de/steamwar/command/ArgumentUtils.java
@@ -0,0 +1,78 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+import java.util.Arrays;
+import java.util.Objects;
+import java.util.function.BiPredicate;
+import java.util.function.Predicate;
+import java.util.stream.Stream;
+
+public class ArgumentUtils {
+
+    private ArgumentUtils() {}
+
+    private static boolean contains(String[] arguments, String string, BiPredicate<String, String> predicate) {
+        for (String arg : arguments) if (predicate.test(string, arg)) return true;
+        return false;
+    }
+
+    private static String[] supply(String s, String[] empty, String[] notEmpty) {
+        if (s.isEmpty()) return empty;
+        return notEmpty;
+    }
+
+    private static <T> String[] tabCompletes(Stream<T> stream, Predicate<T> predicate) {
+        return stream.filter(predicate).map(value -> value + "").toArray(String[]::new);
+    }
+
+    public static Argument<String> of(String... arguments) {
+        return new Argument<>(s -> s, string -> contains(arguments, string, String::equals), arguments);
+    }
+
+    public static Argument<String> of(String[] commands, String[] tabCompletes) {
+        return new Argument<>(s -> s, string -> contains(commands, string, String::equals), s -> supply(s, tabCompletes, commands));
+    }
+
+    public static Argument<String> ofIgnoreCase(String... arguments) {
+        return new Argument<>(s -> s, string -> contains(arguments, string, String::equals), arguments);
+    }
+
+    public static Argument<String> ofIgnoreCase(String[] commands, String[] tabCompletes) {
+        return new Argument<>(s -> s, string -> contains(commands, string, String::equals), s -> supply(s, tabCompletes, commands));
+    }
+
+    public static Argument<Integer> between(int minValue, int maxValue, int... tabValues) {
+        Predicate<Integer> predicate = i -> i >= minValue && i <= maxValue;
+        return new Argument<>(Integer::parseInt, predicate, tabCompletes(Arrays.stream(tabValues).boxed(), predicate));
+    }
+
+    public static Argument<Double> between(double minValue, double maxValue, double... tabValues) {
+        Predicate<Double> predicate = d -> d >= minValue && d <= maxValue;
+        return new Argument<>(Double::parseDouble, predicate, tabCompletes(Arrays.stream(tabValues).boxed(), predicate));
+    }
+
+    public static <T extends Enum<T>> Argument<T> ofEnum(Class<T> enumClass) {
+        String[] strings = Arrays.stream(enumClass.getEnumConstants()).map(Enum::name).toArray(String[]::new);
+        return new Argument<>((s, sender) -> Enum.valueOf(enumClass, s), Objects::nonNull, s -> strings);
+    }
+
+}
diff --git a/SpigotCore_Main/src/de/steamwar/command/SWCommand.java b/SpigotCore_Main/src/de/steamwar/command/SWCommand.java
new file mode 100644
index 0000000..0faa1db
--- /dev/null
+++ b/SpigotCore_Main/src/de/steamwar/command/SWCommand.java
@@ -0,0 +1,145 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandMap;
+import org.bukkit.command.CommandSender;
+
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+import java.util.function.BiConsumer;
+import java.util.function.Predicate;
+
+public class SWCommand<T extends CommandSender> {
+
+    private static final CommandMap commandMap;
+
+    static {
+        try {
+            final Field commandMapField = Bukkit.getServer().getClass().getDeclaredField("commandMap");
+            commandMapField.setAccessible(true);
+            commandMap = (CommandMap) commandMapField.get(Bukkit.getServer());
+        } catch (NoSuchFieldException | IllegalAccessException exception) {
+            Bukkit.shutdown();
+            throw new SecurityException("Oh shit. Commands cannot not register.", exception);
+        }
+    }
+
+    private Argument<?>[] arguments;
+    private BiConsumer<T, ArgumentMap> executor;
+    private boolean lastArgRepeatable = false;
+
+    public SWCommand(BiConsumer<T, ArgumentMap> executor, Argument<?>... arguments) {
+        this.executor = executor;
+        this.arguments = arguments;
+    }
+
+    public SWCommand(BiConsumer<T, ArgumentMap> executor, boolean lastArgRepeatable, Argument<?>... arguments) {
+        this(executor, arguments);
+        this.lastArgRepeatable = lastArgRepeatable;
+    }
+
+    public boolean execute(T sender, String[] args) {
+        if (args.length != arguments.length) return false;
+        Object[] objects = new Object[args.length];
+        for (int i = 0; i < (lastArgRepeatable ? arguments.length - 1 : arguments.length); i++) {
+            Optional<?> optional = arguments[i].valueSupplier(args[i], sender);
+            if (!optional.isPresent()) return false;
+            objects[i] = optional.get();
+        }
+        if (lastArgRepeatable) {
+            Object[] lastArg = new Object[args.length - arguments.length + 1];
+            for (int i = arguments.length - 1; i < args.length; i++) {
+                Optional<?> optional = arguments[i].valueSupplier(args[i], sender);
+                if (!optional.isPresent()) return false;
+                lastArg[i] = optional.get();
+            }
+            objects[objects.length - 1] = lastArg;
+        }
+        executor.accept(sender, new ArgumentMap(objects));
+        return true;
+    }
+
+    public List<String> tabComplete(T sender, String[] args) {
+        if (args.length > arguments.length && !lastArgRepeatable) {
+            return new ArrayList<>();
+        }
+        for (int i = 0; i < Math.min(args.length - 1, arguments.length - 1); i++) {
+            if (!arguments[i].valueSupplier(args[i], sender).isPresent()) return new ArrayList<>();
+        }
+        if (lastArgRepeatable) {
+            for (int i = arguments.length; i < args.length; i++) {
+                if (!arguments[arguments.length - 1].valueSupplier(args[i], sender).isPresent())
+                    return new ArrayList<>();
+            }
+        }
+        return arguments[arguments.length - 1].tabCompleteSupplier(args[args.length - 1], sender).orElseGet(ArrayList::new);
+    }
+
+    public static <T extends CommandSender> boolean execute(List<SWCommand<T>> swCommandList, T sender, String[] args) {
+        for (SWCommand<T> swCommand : swCommandList) {
+            if (swCommand.execute(sender, args)) return true;
+        }
+        return false;
+    }
+
+    public static <T extends CommandSender> List<String> tabComplete(List<SWCommand<T>> swCommandList, T sender, String[] args) {
+        List<String> strings = new ArrayList<>();
+        swCommandList.forEach(swCommand -> strings.addAll(swCommand.tabComplete(sender, args)));
+        return strings;
+    }
+
+    public static <T extends CommandSender> void register(List<SWCommand<T>> commandList, String plugin, String name, Predicate<T> permissionPredicate, String... aliases) {
+        commandMap.register(plugin, new Command(name, "", "/" + name, Arrays.asList(aliases)) {
+            @Override
+            public boolean execute(CommandSender sender, String alias, String[] args) {
+                if (!isInstance(sender)) return false;
+                T t = (T) sender;
+                if (!permissionPredicate.test(t)) return false;
+                SWCommand.execute(commandList, t, args);
+                return true;
+            }
+
+            @Override
+            public List<String> tabComplete(CommandSender sender, String alias, String[] args) {
+                if (!isInstance(sender)) new ArrayList<>();
+                return SWCommand.tabComplete(commandList, (T) sender, args);
+            }
+
+            private boolean isInstance(CommandSender sender) {
+                try {
+                    if (Class.forName(getClass().getGenericInterfaces()[0].getTypeName()).isInstance(sender)) {
+                        return true;
+                    }
+                } catch (ClassNotFoundException e) {
+                    // Ignored
+                }
+                return false;
+            }
+        });
+    }
+
+}