"This only is denied to God, the power to rule free will. Where love rules, there is no will to power; and where power predominates, there love is lacking. The one is the shadow of the other. When the power of love overcomes the love of power the world will know peace."
The Tenshuken (神の鍵, lit. God's Key) is a special key that awakens the Zanpakuto known as Minzokunegai, which the key is sealed within Area 120: Reioh of the Reiji Maigo and the sealed altar of the blade is currently unknown. Termino Muerte is currently after the key and blade in order to bend not only Existance to his will, but to bend free will under his absolute control.