Explore the Swarm of Cranium Rats, a fascinating creature in the 5e tools bestiary with unique characteristics and abilities.. The rats become smarter as a result, and they retain their heightened intelligence for as long as the swarm persists. The swarm also awakens latent psionic abilities implanted within each cranium rat by its mind flayer creators, bestowing upon the swarm psionic powers similar to spells.

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The Cranium Rat, Swarm is a medium beast in D&D 5e with a challenge rating of 5 (1,800 XP). It has 12 AC and 36 hit points. A seething mass of hairless, big-brained rats scurries forward as one entity, their collective chittering forming an almost telepathic harmony while hundreds of glowing red eyes fix upon their target. Armor Class 12 Hit.. The more cranium rats in a swarm, the more intelligent the swarm would become, with an average-sized swarm of rats holding an unnerving level of intelligence. Cranium rat swarms spoke in the collective, using "us" and "we" as opposed to "I" or "me".

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