Magran (GEP)

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Common chant has it that magran are big Deep Ethereal fish, and their appearance supports this assumption (at first): multifinned sleek bodies with multiple eyes, large mouths, and a tendril ending with a little light that dangles before its maw. Any berk knows that appearances deceive, especially on the planes-the magran're actually large reptiles.
A magran hunts other creatures in the Deep using a special lure. A long tendril extends from between the magran's eyes, from which dangles a glowing sphere that can be seen from 200 feet away or more, even through the normally obscuring ethereal fogs. Meanwhile, the magran turns the rest of its body invisible. The membranous organ pulses hypnotically, and any sod close enough falls into a trancelike state. While a creature is mesmerized, the magran moves in close and attacks with its mighty jaws. Unlucky victims are swallowed whole.
Due to some strange aspect of its power of invisibility, living creatures swallowed by the magran remain visible inside the beast, so anyone outside can see them struggling for life within the otherwise unseen creature. When the swallowed sods die, they become invisible like the rest of the magran.
Magran are found exclusively in the Deep Ethereal, never traveling to the Border and never venturing onto another plane. Normally lone hunters, at rare times the creatures gather together in large groups to spawn. Though they do not hunt during the spawning time, they are so peery of outside threats that they attack any creature that approaches the school. Since all members of the group attack together, this is a very dangerous situation for a planewalker to find himself in. Canny bloods avoid magran schools at all costs. (PLANESCAPE MONSTROUS COMPENDIUM Appendix III) 
MAGRAN:AC {J};MV {JB};HD 12;THAC0 9;#AT 1;Dmg 3d8 (bite); SA Hypnosis, swallow whole; SD Invisibility at will; SZ H (20' long); ML average (8-10); Int low (5-7); AL N; XP 8,000. 
SA-Hypnosis: Anyone coming within 30 feet of the magran's lure falls into a trancelike state (treat as a hypnotic partern spell that continuously affects up to 24 levels or HD; victims must save vs. spell every round while they remain in the area of effect). The magran attacks mesmerized creatures with a +4 bonus. A mesmerized victim gains no AC bonus from Dexterity.
Swallow whole: On an attack roll of 19 or 20, the magran swallows i1s victim whole. A swallowed victim can't move around or try to free himself unless he is size S and has a size S weapon. The magran's gullet has the same AC as its exterior. Swallowed victims suffer 1 d 12 points of damage per round from digestive acids, and unless freed, suffocate and die in 2d4 rounds.