Abyss Herald: Final encounter
Once you enter the domain, the doorway on the left side will open up.
This actually leads to the same pathway from earlier (the one with the collapsing floors). Since the floors are now gone, you’ll have to glide across the chasm while avoiding the bubbles.
There are nooks and crannies off to the sides, so you can go there until it’s safe to glide again. Anyway, you’ll eventually reach the chamber with the corrupted Statue of the Seven.
For the final battle against the Abyss Herald in Genshin Impact, you’ll want to beware of the two Abyss Mages that’ll spawn alongside him (Hydro and Pyro).
They’re actually more dangerous than the boss since you could get encased by bubbles and subsequently nuked by flames.
Naturally, once you’ve got the boss down to low health, he’ll switch to his water form. Use Cryo-based skills to completely freeze and debilitate him.
It seems this fella’s quite slippery and he’ll attempt to escape via his portal again. That leads to an epic cinematic, one that further advances the story in Genshin Impact.