Derflinger

is Saito's Talking Sword. It also seems to have the power to warp people.

Derflinger Nicknamed Derf was created by the first Gandalfar. It is actually a Spirit Sword, and upon the Destruction of its form, it can transmigrate to a new sword body over a period of weeks. Derf also seems able to absorb magic from attacks cast at it, which it later uses to feul its Various Abilities.