Just so I'm clear,
This Abyss Trinity is a MK from another world summoned here by Akio's folks with the purpose of destroying this world's MK AKA Arata AKA the Astral Trinity. Arata also has a grimore (that may belongs to Hijiri) named Astil. Okay.
So Abyss Trinity, did jack shit for all this time at the floating library until Akio brought the gang here for this arc. His backstory apparently involving him deciding to change his own fate of being the destructor of his world, by birthing a kid, Lilith...before destroying his own world. Then he somehow sent Lilith to our world, a coincidence that he later gets summoned to this same world by Akio's folks?
Moreover, his world is supposedly destroyed, but he can still somehow get his power back from it? Was he summoned here incomplete? Yet he was still suppose to destroy the Astral Trinity according to Akio's folks?
Also how is his kid the "key" to parallel world and him getting his power back? And with that power he wants to destroy THIS world as well? Talk about rebelling against the system. Also what if Lilith didn't happen to end up at this world he ended up being summoned to? What if Lilith didn't come on this adventure? What if he never got summoned anywhere? He'd just be dead in his own world after he destroyed it.
This made zero sense when I was reading it monthly and forgetting all the details, now I'm reading it from the beginning in one go and this character still makes no sense.