UNFORTUNATELY, only the first person to bother with looking around is allowed to take a risk in investigation. (I don't know what sort of DnD you play where you're allowed to have multiple rolls on the same thing by different people, but that's some crazy talk) Because Yilin is supremely stupid and inept lately, he fails to note the signature flickers in the water of some elemental creatures native to the depths of the sea. While your party moves along, seemingly free to bicker and whine among yourselves like you seem to always do, those same creatures set in around you and set up to strike you down.
From behind you come a series of miniature whirlpools, twisting and pulling at the water like extreme winds, so strong that they could rip your limbs out of their sockets. It takes some effort to avoid - they seem to have only been warning shots. ...but the sources aren't backing off. Maybe they were just sizing up their prey.
Hulking creatures of crystal glow and shimmer in the water, limbs ending in fine, sharp points. They could cut through rock - and they demonstrate this by slicing the ground beneath them in twain. Their bodies reflect your shocked faces, and lack any real faces of their own. More monsters, it seems - Shards. Probably put together by the aboleth in their free time, when they're not busy corrupting people into skum or devouring minds and flesh. They make for very decent guards, and they seem intent on "guarding" you far away from here.