Armor Class 12
Hit Points 2 (1d4)
Speed 30 ft.
Senses darkvision 30 ft., passive Perception 10
Languages telepathy 30 ft.
Challenge 0
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.
Illumination. The cranium rat sheds dim light from its exposed brain in a 5-foot radius or extinguishes the light.
Mordenkainen Presents: Monsters of the Multiverse, p. 83