Saw a picture of ice fishing, and this idea popped into my head.
Large Outsider, Chaotic (NE), Average Intelligence; Solitary
Astral anglers look something like crystaline gulper fish, with massive mouths and long, thick bodies. Their bodies are largely transparent, but the creatures organs are a pulsating pink, and thus can be seen through the monster’s flesh.
ATK: Bite (2d6 + swallow whole)
SV: F8 R9 W9
XP: 800 (CL 9)
Astral anglers appear to exist for the express purpose of eating and swimming. They never speak, and their eyes show not a glimmer of intelligence. In fact, they explorers, slowly mapping the myriad psychic eddies and flows of the Astral Plane, imprinting their knowledge on their gemstone brains.
Mapping an infinite plane is hungry work, of course, which leads to the astral angler’s strategy for hunting. The monster extends a lure into the Material Plane, and when something grabs it, the monster yanks them into the Astral Plane to be swallowed.
An astral angler opens portals into the Material Plane by opening its mouth and expelling a weird humming sound. This weakens the barrier between planes, creating an invisible portal that can be noticed by some creatures as a ripple in space.
Through this portal, the beast extends something like a tongue. This tongue is long and pink in reality, but it is charged with psionic particles, such that in the Material Plane it appears as something the monster’s prey envisions as their fondest desire. The particles pick up needs and wants that a group has in common, so the tongue appears as the same to thing to all. This is an illusion effect, and can be overcome in the normal way.
When a creature touches the tongue, they stick fast to it unless they pass a Will saving throw. A person stuck to the tongue is suddenly jerked through the invisible portal and into the Astral Plane. The portal remains open for 10 minutes, and others can move through it without difficulty.
The original victim that is jerked in is immediately attacked by the astral angler using its bite attack.