The Soul of Might is one of the 7 souls. It is dropped by The Destroyer after the Wall of Flesh has been killed in any world (thus turning on hard mode). The Soul of Might is a drop from the The Destroyer, which is the Hardmode version of the Eater of Worlds. The Soul itself is blue in color, and can be used in the creation of various top-tier weapons and armor. It is a hard-to-get item that is used for some of the best equipment in the game.