I've been drafting a detailed description of a particular monster's physiology and I'm curious if your field experience could help me capture its essence accurately.

Here’s the skeleton: - **Name and basic form**: elongated, amphibious torso, translucent skin revealing swirling bioluminescent veins, a tail with a dorsal fin. - **Purpose (role in story)**: a guardian of the subterranean aquifer; its presence keeps the groundwater clean but its presence is also a threat to any creature that disrupts the balance. - **Core mechanics**: emits a hypnotic bioluminescent pulse that can lull prey, and releases a corrosive mucus that erodes stone. - **Strengths**: regenerative skin, acid saliva, ability to camouflage by changing skin hue. - **Weaknesses**: sensitivity to ultraviolet light and a vulnerability in its dorsal fin that can be targeted with precise strikes. - **Motivation / behavior**: It follows ancient water currents, protects its niche with an almost obsessive calm, yet if its territory is threatened it can become ferocious. - **Signature trait**: the rhythmic pulsing of its skin that syncs with the rhythm of the underground rivers, giving it an eerie, almost living feel. Let me know if you want more depth on any of these points.