Infinity Dagger

The Infinity Dagger is the most ancient and powerful weapon in all the known universe. After it was broken apart, Zack planned to locate the Shards and reassemble the weapon so he could rule over Fin-Land and the Land of Ooo as a "benevolent god." His efforts were thwarted by TFAWPS, who also used the Dagger to destroy the Cosmic Entity, that was threatening to destroy the planet.