Talk:The Corruption/@comment-3360973-20111224023650/@comment-4674838-20111226191828

The 500 block limit may still be a requirement for summoning the Eater of Worlds boss. If you just want to farm Eater of Souls though, you don't need 500 blocks of ebonstone. I have technically spawned Eaters from as little as 100 blocks of ebonstone in patch 1.1. More corruption will increase the chance of spawning Eaters though. If your artificial corruption is very small then it'll be more likely for other monsters from the default biome to spawn.

Size and shape do not matter. Having it floating in the air will not prevent corruption mobs from spawning. The 500 block thing is a good suggestion for the size of an artificial corruption.