Gellish

It pulses through the mid-depths with real intent, herding small fish against the surface with its longer, stronger tentacles before drawing them in. Its sting has sharpened into a proper defense, and its bell can flash a sudden bright pulse that dazzles a would-be predator in the murk. It travels in loose companies that coordinate their glow, and a hunting party of Gellish lighting up in sequence to drive a bait-ball is a genuinely eerie sight, a slow blue lightning moving through the dark water.