Afterward he asks a Mage to destroy him so that he won't have to remember it anymore.
Arguably the worst aspect of the Abyss is that it's not hostile.And it grows wider each time Mages cause too much Paradox, slowly making it harder for magic to exist in the Fallen World and potentially destroying reality entirely. This void is the basis for the Lie, what is separating mortals from the Supernal and preventing them from using or even understanding Magic. The Abyss is the fracture separating the two: a gigantic, bottomless void inhabited by everything not touched by the Supernal and everything unreal - including very dangerous Eldritch Abominations of all sort known as Abyssal Intruders, who feed on destruction, chaos, corruption and the damages caused by Paradoxes. The entire concept behind the Abyss ever since the Exarchs made Atlantis fall (or the war with them destroyed it it's difficult to say), reality has been literally shattered, separating the Fallen World from the Supernal Realms.