Ascension

Ascension is the process in which mortals are risen to divinity and become beings known as an @.

Manifestation

It is unknown if they truly lose their memories upon ascension or if they're lying about it, not caring about their mortal self from their ego death.

For example,
Alistair doesn't say that he doesn't remember, he just refuses to talk about it, saying that it's irrelevant to who he is.