Symbiotic host of Anima, despite being otherwise dead for over 2500 years
Attello Hasting died. That is a known fact, there were witnesses to the event.
It is hard to tell how Anima came to him, or how exactly it managed to return Attello to life. What is certain is that Anima is bound to Attello just as much as Attello is bound to Anima. Attello is the key to Anima's ability to travel beyond the confines of Aris, its realm of origin, to which it was supernaturally tethered. On the other side Anima is the key to Attello's very existence in the Multiverse.
Attello can channel Anima's power to an extent, mostly manifesting in telepathic abilities, including the ability to direct pain or pleasure directly to a persons nervous system and mild psychokinesis related to creating mental shields to protect against physical attacks.