Ame-no-Murakumo-no-Tsurugi

In the years after the nightmare Invasion, the Ame-no-Murakumo was relegated as nothing more than a sacred object lying on a cloth in the Core Temple, for no hero of Mina has shown the aptitude to wield it yet...

Power of the Youkai (Active) (4)
Ame-no-Murakumo-no-Tsurugi is a powerful sword that has the ability to channel the powers of any of the youkai. It can temporarily boost its powers by sacrificing a youkai on its blade.

History
The Ame-no-Murakumo-no-Tsurugi has only truly been used once, During the Divine War between Gilgamesh and Hazet. It is also one of the Sacred Treasures of Mosooriku.