43d9043f_Biome___Official_Terraria_Wiki__Name
[Block Requirements] At least 200 Corrupt Grass, Ebonsand Blocks, Ebonstone Blocks, Purple Ice Blocks, Corrupt Thorny Bushes, or Vile Mushrooms [Location] Any [Compatible Biomes] Not Forest, Meteorite, or Hallow [Name] 
Corruption
Biome - Official Terraria Wiki