[Chaos]

absorption is super strong

Absorb on player side is a joke. Nihilists were made to completely screw them over without recourse, since the wearer would often have no immunities/absorbs themselves, and their target often had serious downsides to their absorb effect. The only thing you would have to change about that racial, if you wanted to balance it out, is making the Lightning weakness stronger. However, since it can be deactivated with a no-cost-to-you hand equipment, I seriously doubt it needs to be made that dire.

Anyways, here's what I think:

-Gnash and Bloodfrenzy seem fine so far. I say this due to the fact they both rely on a status that can be swatted off with any sort of healing
-Under the Depths seems a bit on the strong side, but considering Nihilists, I'm willing to give it a shot
-Rough Skin sounds interesting, and seems rather tame
-I would set APT to 0 and put those points towards GUI and VIT, since this race is less about being all-around and more about being up in someone's face

The only issue I see with the race is that I feel it's a little too much of an aquatic version of Shaitans. That's just me, however.