When isolated, cranium rats behaved like ordinary rats, using their telepathy to communicate basic feelings. When forming a swarm, however, the collective intelligence of the rats was combined into a single collective entity, which could also access enhanced psionic abilities from the mind flayer that created them. In such cases, a swarm of cranium rats could use psionic powers similar to spells.
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- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Wizards RPG Team (2016). Volo's Guide to Monsters. (Wizards of the Coast), p. 133. ISBN 978-0786966011.