Behind the streaking cloud of ink, the dead Chuul and the enormous crab skeleton continued their charge, plowing into the line of living crab soldiers with hidious recklessness.
The undead Chuul were leaking partially cauterized fluid the color of iodine and crackling at every joint.
GM, I'll let you handle these guys since I'm posting from my phone. They are Shocking Bloody Chuul skeletons, their full stats are in the alias. They're mostly window dressing, so feel free to hand wave them to save time if you want.
They're in the smoke, so they have miss chance, but they have a Shock Aura (which I believe is amplified by your underwater electricity rules), so there's a good chance they'll do damage just by being near things.