Hydra.

Every mob you kill comes back as three of itself where it fell. Slay a hundred heads before they bury you.

The rules.

Each rule waits for its event, checks its if, then runs its steps in order; a branch or a loop's steps are set in.

Kit
When the challenge starts
1. Give Head cleaver to everyone
2. Give 16 Steak to everyone
3. Show the title “Hydra” to everyone
Three grow back
When Undead (any) is killed
At most once every 0.25 seconds.
1. Add 1 to heads
2. If how many the mobs tagged hydra is below 60
  1. Spawn 3 of the event's mob type at the event's place spread 2 blocks
  2. Play Evoker prepares summoning to everyone
  3. Show “The {mob_type} grows three more heads” above the hotbar of the player
  Otherwise
  1. Show “The hydra has no room for more heads” above the hotbar of the player
Count the heads
Every 2 seconds
1. Set alive to how many the mobs tagged hydra
Heads rage
Every 90 seconds
1. Give the mobs tagged hydra Speed for 20 seconds
2. Set whether the mobs tagged hydra glow to yes
3. Send “The heads are furious.” to everyone
Buried
When a player dies
1. Lose: “{player} was buried under the heads.”

Variables

Custom items