CONTAINS SPOILERS
Chapter 11: Dig Down (Thanos Battle)
When you reach the part in Chapter 11 inside of Drax’s mind, you’ll eventually make your way to a wild boss battle with Thanos. He’ll duplicate himself into multiple clones and although you can try to fight all of them off, don’t. Instead, once you reach the point where it’s overwhelming and there are nearly 10 copies of Thanos fighting you, just die. A cut scene will play and you can move on.