The Beginning

In this fanfic crossover!! When the mad titanThanos attains a power unlike any other, The Demon King Yinn seeks excitedly to take him on head first! But to take on such a powerful being alone would not be trouble for him.. But! In times like this he doesn't seek Battle for winning. He does it for the fun of the game.
Searching through every universe he can think of, he finds many who want to come to his cause.
But when Thanos gains omnipotence he peers through the fabrics of all existences seeing worlds beyond his own Multiverse. Yinn is coming for him, with an army unlike any other!! Many Movie and Comic characters join him. But will they win this war? Or Fail?