The alliance between the X Men and the Avengers

What if everything you know isn't true?

During the Avenger's final battle, Tony died. But suddenly the Avengers get a strange message. Maybe Tony isn't dead after all and is alive? While the remaining Avengers still have the strange message, they are suddenly attacked. The Avengers are still weakened by losses sustained in battle. While trying to compensate for the attack, they get help from the X-Mens of all people.
In order to be able to defeat their "enemy", they negotiate a deal.

But during the fight it turns out that not only the Avengers but also the X-Mens have old enemies who want revenge. This means that everyone has to decide which side they are on.
Can they save Tony while preventing the "end of the world"? Can the Avengers and the X-Mens win together?

Attention: Some figures are self-made. Also, some of the characters that Marvel says are dead are alive here in the story.
Refers to the X-Men trilogy (the movies) and Avenger Endgame. Deviations to "X Men Logan & Star" possible.