This information is datamined and information is speculative as the encounter has not, and likely will not be tested.
Ula'tek Animations
Ula'tek is the final boss of The Venomous Abyss raid in Patch 12.1 and we learned some brief details last week in the Curse of Ula'tek preview. As Ula'tek is the final boss, it's unlikely that this boss will be tested on the PTR, so players will need to wait in order to see what the boss fight looks like in person.
However, Ula'tek has some very awesome animations that we wanted to show off from our datamining.
Casting?
This first animation has Ula'tek raising her arms and possibly looks like she may be spitting something into the air.
Wing Sweep
These animations have Ula'tek doing a sweep across the arena with one of her arms. It looks like it has a lot of force behind it, so while it's possible to be an auto-attack it could be a big tank-buster or causing a wave across the arena.
Spitting
In this animation, all of Ula'tek's heads are raised into the sky, and could indicate that Ula'tek is channeling something or possibly spitting a lot into the air.
Resurfacing
The last datamined animation looks to be Ula'tek resurfacing after diving. Alternatively, this could be the spawning animation when you first encounter Ula'tek.
