Zombies
From King Arthur's Gold Wiki
As of the "Zombies Release"[1] update, Zombies is a gamemode in which players attempt to survive in a randomly generated world against a never-ending undead horde. The zombies live in randomly generated castles and dungeons. Information on the gamemode is scarce, besides the little bits that are leaked by the devs and testers every now and then.[2]
Zombies Features
Multiple Zombie Classes Randomly Generated Dungeons/Castles "Wang Tiles"