Wo Long: Fallen Dynasty

This DLC introduces three new main battlefields and seven new sub battlefields. Like with the base game, completing main battlefields unlocks new sub battlefields. However, there is one exception in this DLC: the final sub battlefield, 'Beyond the Heavens,' is only unlocked by finding three hidden scrolls in this DLC. Reports of where to find these vary, and from what I can tell, they seem to be random drops. One article I found says they're in each of the three main battlefields, but that's not where I got them. I got one in the second main battlefield, one in the third, and one in the first sub battlefield. Additionally, for me, I found two in chests and got one as a drop from a random enemy. It therefore seems like all three scrolls are random drops, and can be obtained from any chest or enemy in this DLC. I will update this if more information comes to light, but for now I would say it's in your best interest to kill every enemy you see in each mission, and open all the chests you find (and explore to find them).