Spiritus is a Discipline unique to the Ahrimanes bloodline that allows them to interact with animalistic spirits. At its most basic levels it allows the vampire to speak with and summon spirits, but at higher levels power can be channeled from them to strengthen the Ahrimane. Spiritus was never (officially) updated into either Vampire: The Masquerade Revised Edition or Dark Ages: Vampire, but it has been updated in 20th anniversary edition.