Talk:Starter Guide/@comment-206.255.181.189-20120119051724/@comment-101.162.47.98-20120308050528

Actually, Eye of Cthulhu has certain criteria to spawn naturally. Basically, an Eye of Cthulhu has a 1/3 chance of spawning every night after you have at least 200 health and there are at least 4 NPCs in your world (this includes the Old Man at the dungeon) as long as the Eye of Cthulhu has not been defeated already on THAT world. When you get that message, it means that the Eye of Cthulhu will soon awaken, so you'll have to fight it (only happens at night). look it up on the Wiki for more help.