The Immortal Breaker (
Gallia Sphyra: Outseal is an Immortal Breaker. It is a Legacy Weapon designed by humans during the Prime Field War for use against the Prime Fields. As a result, it was given the ability to harm immortals.
Mai Hazuki used Outseal in BlazBlue: Variable Heart against Fuzzy, which harmed him, as he is a vampire and thus immortal.