Tiny Monstrosity, unaligned
Armor Class 11
Hit Points 28 (8d4+8)
Speed fly +30, walk +0, hover true
Challenge 1
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities psychic
Condition Immunities blinded, charmed, deafened, petrified, poisoned, prone, stunned
Senses blindsight 60 ft., passive Perception 10
Languages understands Void Speech but can’t speak
Reproduce. When a grimmlet takes damage from a spell and isn't reduced to 0 hp, a number of new grimmlets equal to the spell's level appear in unoccupied spaces within 10 feet of the grimmlet. If the spell is a cantrip, only one grimmlet is created. Sixteen or more grimmlets within 30 feet of each other can use their reactions to come together and form a grimmlet swarm in a space within 5 feet of one grimmlet.
Self-destruct. When the grimmlet dies, it explodes in a spray of Void-infused crystal shards. Each creature within 5 feet of the grimmlet must succeed on a DC 12 Dexterity saving throw or take 3 (1d6) slashing damage and 3 (1d6) psychic damage. Grimmlets damaged by this trait don't Reproduce.
Innate Spellcasting (Psionics). The grimmlet's innate spellcasting ability is Charisma (spell save DC 12, +4 to hit with spell attacks). It can innately cast the following spells, requiring no components: At will: crushing curse, minor illusion 3/day each: maddening whispers
Crystal Edge. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) slashing damage plus 2 (1d4) psychic damage.
Source: Tome of Beasts 2 · OGL/Open