Aeternitas needs to go back to hell, like bro if it wasn't for you Anastacius' and Claude's brother relationship would be good.
If you want to ask if Aeternitas is in Anastacius' body when he's still young the answer is NO but Aeternitas somewhat brainwashed Anastacius and yes he's the root of all Anastacius' bad decision.
Aeternitas needs to go back to hell, like bro if it wasn't for you Anastacius' and Claude's brother relationship would be good.
If you want to ask if Aeternitas is in Anastacius' body when he's still young the answer is NO but Aeternitas somewhat brainwashed Anastacius and yes he's the root of all Anastacius' bad decision.