Adds the Corruption biome from Terraria! It spreads!
It can only spread to corruptible blocks:
Purification Powder is used to purify the Corruption, while Vile Powder spreads it. These are currently only available in creative.
The Corruption is home to a new powerful ore: Demonite! It makes the Nightmare Pickaxe, Light's Bane, War Axe of the Night, Tiller of Souls, and Grave Digger.
