Illumination. As a bonus action, the cranium rat can shed dim light from its brain in a 5-foot radius or extinguish the light.

Telepathic Shroud. The cranium rat is immune to any effect that would sense its emotions or read its thoughts, as well as to all divination spells.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:1 piercing damage.