Cerberus

A band of mercenaries steals Attila the Hun's fabled sword and inadvertently awakens the most feared creature in all of mythology - Cerberus, the monstrous three-headed dog with a thirst for blood.

Cerberus is a 2005 adventure fantasy movie directed by John Terlesky, starring Garret Sato, Greg Evigan, Gabi Andronache. It holds an IMDb rating of 3.7/10 from 1,396 votes and runs 1h 32m.