Hidden Graveyard

Old-school mob arena. Press the beacon to start. 5 waves, 1-5 random mobs per player each wave, armour gets better every wave: leather -> chain -> iron -> gold -> diamond. Mobs always chase the closest player. After each wave the beacon comes back - press it for the next wave or it auto-starts in 10s. After wave 5 the final beacon opens the exit portal (no lever in this room). Kit: 8 golden apples + 6 stacks of 8 Instant Health II splash.