Talk:Skeletron/@comment-76.230.192.47-20110910013515/@comment-4547367-20111023154024

Well, had you fought the Eye of Cthulu on that world before, had you broken 1 shadow orb, and did you have over 200 HP? If all those boxes are ticked, there's your answer, sport :P He has a 1/3 chance of spawning if all that criteria is A-OK at night.