The enigmatic origin of Jax Finally solved?

Over the years Jax has received very little information on his origin or his purpose before he joined the league, but with the arrival of "None shall pass" came what I believe to be a new source of information helping us put together the puzzle of who (or what) Jax really is.

Reading this as a long time Jax main made me giddy with excitement. for the first time we know what could be the point of origin of Jax...Icathia

Icathia is a lost city that has long been forgotten by many and said to be but a fable to those who have knowledge of it, its also said to be the main point of entry between the Void and Runeterra, so when Jax has distant memories of this ancient place now plagued with the void (monsters) it tells us two things

1.He lived in pre-void Icathia and may have been there at the time of the voids arrival and now seeks revenge on void for destroying his one peaceful home.

2.He may have been aware of Icathia but met the same fate as Kassadin and malazahar being corrupted by the void in his journeys explaining his non-human/void born appearance. (could be why he wears a mask being ashamed of his now connection with the void)

What i can tell from reading "None shall pass" Is that Jax has been on the search for some one to join him on what seems to be his quest from the quote "After all, a warrior worthy of fighting at his side in the battles against the monsters from beyond would need to be adaptable." now the part in this that really intrigues me is the mention of monsters, Jax repeats this phrase when being challenged by the Demacian soldier “Monster?” he said, rising to his feet in one smooth motion. “I could show you monsters, but I fear you wouldn’t live long enough to tell anyone what a real monster looks like." Jax is usually a light-hearted champion in his persona but this line really seems to have struck a nerve with Jax making him turn almost cold and icy remembering a terrible event he had once seen (the destruction of his home). This all links back to the fate of Icathia and explains why he is set out on stopping the spread of the void.

I have so much more about this theory involving the involvement with darkin that i thought it best to get someone else's opinion on my theory and carry it on at a later date (if wanted to) so please leave any suggestions on what you think the origin of the lamp post king could be.

Thank you.