Blooded

Chirayoju, an ancient Chinese vampire, and Sanno, a Japanese Mountain King, have been fighting for years. Their spirits were imprisoned in a sword by a curse. The sword arrives in Sunnydale and while viewing the Japanese exhibit at the museum Willow becomes possessed by the spirit of Chirayoju and Xander, later on, becomes possessed by the spirit of Sanno. Buffy must figure out a way to stop the two spirits without killing her own friends. During the final battle, when the fight takes an ugly turn, Buffy must also keep her own spirit alive.