User blog comment:CaptainLocoMoco/Please help me figure out how to kill the destroyer!/@comment-4524434-20111209175904/@comment-1840954-20111209201555

Just wanna mention that you cannot get the Megashark without crafting it using the Soul of Might - which is dropped by The Destroyer. Hence you can't kill it for the first time with a Megashark unless you cheated to make it/got it from friend.