Multiverse And Omniverse system for my story...

Let me explain about multiverse first...

Multiverse, a hypothetical collection of potentially diverse observable universes, each of which would comprise everything that is experimentally accessible by a connected community of observers. The observable known universe.However, this universe would constitute just a small or even infinitesimal subset of the multiverse. The multiverse idea has arisen in many versions, primarily in cosmology, quantum mechanics, and philosophy, and often asserts the actual physical existence of different potential configurations or histories of the known observable universe.

Then comes Omniverse..

Omniverse is a verse which contains everything that's exists, besides other things that go outside of th existence, i.e. no existence.....like Outer Gods. It just contains all the verse that contains all existences.

(Outer Gods mean....Chtulu, Abhoth, Nyarlathotep, etc...)

All of these creations come from the a single being... known as Mother of Chaos...She created the whole Omniverse by surrounding a barrier to protect it from All the Outer Gods.

(As for who's Mother of Chaos... I will explain in chapter because it is related to MC's backstory and birth....NO MORE SPOILERS*)

Within it,... everything exist....like MhA Multiverse (currently MC residing), Naruto Multiverse, Bleach Multiverse, Harry Potter Multiverse, DxD multiverse, One Piece Multiverse, Fairy Tail Multiverse.....etc,...

So, when all this multiverses mixed together are called Omniverse.....

So,

In simple words, my whole story is taking place inside the Omniverse. Even if the MC along with his harem travelling between world or multiverse but they are still residing in Omniverse. That's why MC can travel back to any world he had been to....but In future when he gained his full power, he won't be needing the help of God to travel...He can travel to anywhere he likes even to the world he never had gone to...all this will be a piece of cake for him.

Now, the God who helps Atulya is one of the strongest being. As for why he's helping will be reveals in later chapters....And MC died in the fight against all then outer gods (why and how many outer gods will explain in chapter)

As his soul was about to vanish but it mixed with a human soul ....and slowly his soul is healing & returning to its peak..but to mix the both souls is something even the God cannot do because Atulya's own soul is the ever strongest soul to exist. As he was not able to mix the soul, he along with the help of some others, sent Atulya with a mix of his and a human soul to the existing world to gain all his lost power that he had scattered during his last breaths... So, this is how Atulya only remembered all the animes, comics, manga, etc....