In the beginning of time they was an entity called the Hollow King.
He was considered the strongest entity in the whole multiverse, feared by all whom heard his name. This man was indeed strong being able to bring about millions and millions of soldiers from the dead and commanding them towards victory, this man rebel against Demi-Gods and other universal entities he was the only strong enough to destroy the entire multiverse with one finally move but before he could do that he retired and before he could make his peace he was killed but his spirit traveled the multiverse in hopes of being reincarnated back into a full being again.
It's been a million years since he was killed and the multiverse remained happy and peaceful that was until they begun a fighting amongst themselves and soon after a war broke out and eventually everyone was fighting.
Each Universe had a Demi-God as a form of defense and the strongest offensive. No one understands where this all originated from but all they knew was it had to end with one universe out of seven to get wiped out, everyone hoped it be the third universe because they had no Demi-God at there disposal and they weren't exactly strong nor valuable in anyway but what they didn't know was that the hollow kings eclipse was about to descend upon them and everything was about to turn heads and tables.
In legends it's said that the hollow king will return and when he does it's an eclipse that will go through all the universes and everyone and everything will be thrown In to complete darkness.