TEXT: Hereticwerks.blogspot.com
  No. Enc.: 1d4 (3d4)
  Alignment: Chaotic (Evil)
  Movement: 10’ (10’)
          Swim: 120’ (40’)
  Armor Class: 5[14]
  Hit Dice: 3+1
  Attacks: 1
  Damage: 3d4
  Save: F4
  Morale: 5
  Hoard Class: 1d6 bits of random junk 
  might be fished-out of their watery lair, if 
  you have the time, patience, and don’t 
  mind extra wandering monster checks.
  XP: Somewhere between a Giant Crab 
  or Crocodile, depending on how you run 
  them.
  Mostly transparent, these aquatic horrors exude 
  an oily luminosity that extends out to around 30’, 
  making it next to impossible for the things to 
  sneak-up on anyone...unless, of course, you’re dis-
  tracted and paying too much attention to the pretty 
  lights and not watching out for the creature itself.
  Their gaping maws are filled with stiff bristles, 
  tiny mandibles and pedipalps that are used to vig-
  orously abrade and lacerate their victims in order 
  to feed off of their precious bodily fluids.
  Those wearing leather, cloth, chitin or similarly 
  ‘soft’ armor types can opt to have their armor 
  class reduced by one place instead of taking dam-
  age from a Luminous Bristle-Maw’s attack, how-
  ever doing so means that the armor is ruined and 
  cannot be repaired. Armor can only be reduced to 
  AC 9[10] at which point it is totally destroyed.
  Luminous Bristle-Maw
  Text is declared Open Game Content. Artwork Copyright 2014, Garrisonjames.
  
SOURCE: textdata/thevault/Labyrinth Lord (osr)/Monster Manuals/LL - Luminous Bristlemaw.pdf