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A barren, frozen planet. A pristine icefield, burnished and cleared by constant katabatic gales. Graven in elegant Old High Martian glyphs a meter deep in the never-thawing ice, a mathematical proof of such beauty and elegance as to make a genius weep...and a series of universal planetary coordinates. No advanced species could forbear to investigate further! These are the work of the Neh-Thalggu, more commonly known as the Braincrabs. Know them. Fear them. Do not trust them. Rugose and four-limbed, the first instar is little more than a brain-shaped crustacean beast. (Little Nolzur's Intellect Devourers, came with the Alhoon or Illithilich.) They are shed when the parent has a surfeit of brains and wishes to jettison lesser ones to make room for greater. Most perish, being less clever than their prey. But if one can bring down a sentient creature through luck and stealth and devour its central ganglion or brain...it begins to grow, absorbing the knowledge and cunning of its prey, much as some sea slugs repurpose the stinging cells of their prey and make them their own. After absorbing a few brains, the instar grows into a juvenile. This involves generating more frontal eyes and a pair of brutal skull-cracking pincers. Recently-added brains are sequestered into thin-shelled bubbles, an adaptation to make sure other, stronger Braincrabs do not kill them when marauding. The juveniles are very dangerous, acting as psionic predators with the strength of a tiger and the intelligence of three or four sentient creatures, all brought to bear on the problem of obtaining more brains. Depending on its previous history, it is very likely to outwit the average sentient being. A Braincrab that has assimilated more than eight brains again metamorphoses, this time into a mountainous, many-limbed hulk, a spiny rugose colossus with a first-class think tank worth of neural tissue working for it. Psionic power abounds, and the elder Braincrab can create immersive illusions at-will or psychically dominate lesser wills. The really unpleasant bit is the way it will out-argue you and succeed. It can make an excellent claim to being a Utility Monster, better at experiencing both reality and pleasure in the cosmos than us single-brained chumps. And what gives it the most pleasure, on the level you and I could never experience? (for so it claims, and has data to back it up--is the data faked? if so, it's too good for us to be able to tell!)? Why, devouring and assimilating more sentient brains! Do you have inconvenient brains in your society? Antisocial or sociopathic ones? It can redirect those energies! Oh, it's a persuasive monstrosity! The Martians fear and detest them, of course, having as they do great juicy brains practically dripping psionic energy. But hunting something that is hunting you, while your strongest weapon is their favorite prey--it's not easy! A Martian High Intelligencer can outwit all but the eldest Braincrabs, but the gamble is a perilous one indeed. You do NOT want a braincrab with the powers of a High Intelligencer. That's how you get a planet converted to a brain farm, which in turn leads to Great Old Ones. Not even once! Oddly, the best defense against the Braincrab is a hive of the insectoid Mandibulate Commonweal. One has the intelligence of a beast, two of a slightly smarter beast, five of an average human...and a whole hive can rival a supercomputer. Their individual brains are not worth a Braincrab's attention, and yet the hivemind can outmaneuver it intellectually as easily as the workers can swarm and savage it physically. The Commonweal will not gain knowledge from the reclaimed brains, though. Only nourishment. Below, how to make a juvenile Braincrab.