Large, controlled areas of the world which have been swallowed up by corruption, becoming the designated lands of residence for many of the more dangerous or contagious corruptor residents.
Currently an entirely unexplored biome, found in a region lost to the sea years ago, these are lands filled with the spread of Necrotica, where not everything may appear as it seems. Species morph and deform into evolutionary traits they shouldn't have, plants grow unusually huge and bioluminescent, and waters become strange, neon colours.