Cranium Rat

Tiny Aberration, Unaligned

STR
2 (-4)
DEX
14 (+2)
CON
10 (+0)
INT
4 (-3)
WIS
11 (+0)
CHA
8 (-1)
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.

Actions

Bite.

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

Bonus Actions

Illumination.

The cranium rat sheds dim light from its exposed brain in a 5-foot radius or extinguishes the light.

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Cranium Rat

Source: Mordenkainen Presents: Monsters of the Multiverse, p. 83 - Licenses and attribution