Essence of Innocence

It is a blackish green blade with a silver hilt That looks like it's etched in teeth, an eldritch eye like gem that is a shadow purple with flakes of silver at the end of it's pummel.

A blade given to Seraph by by ancient Eldridge being know only as Zermis The Black to a very selective few still living beings as their pact

It starts off as a normal sword but grows with its welder