MobArena

The MobArena minigame, available on RetroMC, involves players killing waves of hostile mobs using items from classes the players choose, and it gets more difficult with each successive wave.
Rewards are greater the longer players survive.
/warp mobarena can be used to teleport to the exterior of the arena.
The MobArena configuration (currently 1.17d) has been updated several times – see MobArena/Changelog.

Commands

/mobarena is the base command.

join - Enter the lobby, where a class can be chosen.
leave - Leave the arena/lobby.
spectate - Enter a safe area in the arena to spectate; can't be used mid-game.
notready - Lists players who aren't marked as ready.

Shortened commands

/ma = /mobarena
j = join
l = leave
spec = spectate

Gameplay

Lobby

Upon entering the lobby, inventories of players are taken and would be restored upon conclusion of the game.
There are a bunch of wall signs that can be punched to select a class.
Each class has its own perks and downfalls; see #Classes.
Players are marked as ready when they punch any iron block in the lobby.

In the arena

Due to exploits, dropping items is disabled.
There's a few seconds of rest before each wave starts.
After each successive wave, additional enemies appear when the next wave starts and every so often, a reward is added when that happens.
There's a timer that resets when you defeat a foe; should the timer expire, players would be kicked from the current game in-progress.

Foes

Zombies
Skeletons
Spider
Hostile Wolves
PigZombies, also known as zombie pigmen
Monster, also known as the humans, the hostile mobs from Minecraft Infdev

Classes

Dev (server operators only)
Attributes	TankTest	DamageTest	SupportTest
Armor	No information available
Weaponry
Food

Tank
Attribute	Brute	Paladin	Rougueknight
Armor	2 Golden Helmets 2 Diamond Chestplates 2 Diamond Leggings 2 Diamond Boots	Diamond Helmet Diamond Chestplate Diamond Leggings 2 Diamond Boots	Iron Helmet Diamond Chestplate Iron Leggings Iron Boots
Weaponry	Fishing Rod	Stone Shovel	Golden Axe
Food	5 Golden Apples 10 Cooked Porckchops	5 Bread 1 Golden Apple	8 Bread 4 Mushroom Stews

Damage
Attribute	Mercenary	Warrior	Archer
Armor	Iron Chestplate Iron Leggings Iron Boots		Leather Cap Leather Tunic Leather Pants Leather Boots
Weaponry	Iron Sword Bow + 256 Arrows (4 stacks)	Diamond Sword	Golden Sword Bow and 832 Arrows (13 stacks)
Food	4 Mushroom Stews	3 Mushroom Stews

Support
Attribute	Harvester	Alchemist	Bard
Armor	Iron Helmet Iron Chestplate Iron Leggings Iron Boots	Leather Helmet Iron Chestplate Iron Leggings Diamond Boots	Chain Helmet Iron Chestplate Iron Leggings Chain Boots
Weaponry	Golden Axe	Stone Axe	Golden Sword Bow and 150 Arrows (2 stacks + 22)
Food	10 Cooked Porkchops 5 Golden Apples 30 Bread	3 Golden Apples 12 Cooked Porkchop	24 Apples 5 Golden Apples 2 Mushroom Stews

There is a 'Donor' section, but there's no classes under that category as of now.

Wave-specific info

Wave 8

The only foes here are groups of Monsters/humans.

Wave 10

This wave consists entirely of a swarm of zombies with just 1 HP.

Wave 15

Zombie pigmen are summmoned from lighting strikes at the corners of the arena, which makes this wave a chance to get cooked pork.

Wave 20

The only foe in this wave is a boss, a spider with a lot of HP. Its attacks are:

Warp: It teleports somewhere else in the arena to evade attacks.
Arrow: One arrow is shot at a random player.
Fetch Target: Teleports a random player to itself.
Root Target: Traps a random player, locking their camera and position.

The boss, when defeated, disappars alongside a sound of an explosion.

Wave 39

This wave and the next one are the showcases of the embodiment of PETA's fury. How?

A swarm of wolves!

Not many players have gotten to this wave before.

Wave 40

You'll encounter a wolf with a ton of HP, and it has different attacks compared to the one in wave 20:

Warp: It teleports somewhere else in the arena to evade attacks.
Lightning Aura: Summmons one bolt of lightning straight from the sky at the wolf's location. Spectators can also be attacked.
Throw Nearby Players and Throw Distant Players: Title says it all.
Shuffle Positions: Swaps positions of itself and another player(?)

The boss disappears when defeated and a sound of an explosion plays.