Secret Wars by Jonathan Hickman Omnibus

For Earth's Mightiest Heroes, it's all been building to this. One by one, the realities of the Multiverse have collided and been destroyed, leaving theirs as one of the last dimensions standing. Now the Final Incursion is here — and neither the Avengers nor the Illuminati will be able to prevent time running out on the Marvel Universe! And when the end comes, all that's left of the Multiverse is a single, patchwork planet where the survivors from the different realities that form it all bend their knee to its master: Doctor Doom! What strange creatures inhabit this Battleworld? Which familiar faces will return? And what happens when the planet's various domains go to war? The victors of the Secret Wars will determine what comes next!

COLLECTING:Avengers (2012) 35-44, New Avengers (2013) 24-33, Free Comic Book Day 2015 (Secret Wars) 0 (A story), Secret Wars (2015) 1-9