Gremishka

Tiny Monstrosity, Chaotic Evil

AC: 14

Initiative: +2 (12)

HP: 31 (7d4 + 14)

Speed: 30 ft.

STR
12 (+1)
DEX
14 (+2)
CON
15 (+2)
INT
11 (+0)
WIS
14 (+2)
CHA
4 (-3)

Senses: Darkvision 30 ft., Passive Perception 12

Languages: understands Common but can't speak

CR: 2 (XP 450; PB +2)

Habitat: Urban

Treasure: Arcana

Magic Resistance.

The gremishka has Advantage on saving throws against spells and other magical effects.

Actions

Bite (Individual Form Only).

Melee Attack Roll: +4, reach 5 ft. Hit: 5 (1d6 + 2) Piercing damage plus 7 (2d6) Force damage.

Reactions

Magic Allergy (Individual Form Only; 1/Day).

Trigger: A creature within 30 feet of the gremishka casts a spell. Response: The gremishka regains 15 Hit Points, then becomes a Medium swarm of Tiny creatures.

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Gremishka

Source: Ravenloft: The Horrors Within, p. 249 - Licenses and attribution