Genshin Impact: Oceanid
Right, now here's a tough one. This boss shows the power of numbers by sicing a bunch critters made of water on you. I consider it a good run if I get through without anyone dying.
If possible, don't use powerful Burst skills in the 1st and 2nd waves, since from the 3rd wave onward 2 types of enemies will spawn at a time. In particular, waves 3 and 5 show up without really giving you advance warning for their placement.
The mobs can't be stunned but they can be Frozen, you might make use of it to reposition yourself or buy time for skills to come out of cooldown.
The frogs and the fat birds explode when you defeat them, you have to get very far away to avoid the blast (easier said than done when the arena keeps shrinking)
I find that the flying birds are REALLY hard to dodge, especially if there's more than 1 to keep track of. I try to get rid of them ASAP; and yes, Razor's shockwave reaches high enough to tag them.
Some of the more chonky enemies regenerate health, so try to focus down 1 at a time.