Talk:Eye of Cthulhu/@comment-31.54.236.25-20121022231715/@comment-46.162.74.235-20121102194217

Its not a glitch, he can spawn without being summoned if these condisions are met:

At least one player in the game world has at least 200+ health.

There are at least four NPCs in the world. Note that the Old Mandoes count as one of these 4.

The Eye of Cthulhu has not already been defeated in the world.