Grimmlet

A jagged shard of smoky translucent crystal, approximately the size and mass of a housecat, hovers before you. Despite its seeming lack of interest in anything that lies around it, something about the creature’s non-symmetrical appearance feels offensive to the natural order.

Strange Families. A grimmlet’s method of reproduction, creating near clones of itself when injured by arcane energy, can cause them to quickly gather in large familial swarms. Strangely, a grimmlet can only swarm with other grimmlets created from the same progenitor grimmlet and with the progenitor itself, and after about an hour, these swarms disperse and move away from each other to create new swarms through magic injury.

Whispering Menace. Grimmlets do not speak. In fact, they never communicate with other creatures via any known form of language or telepathy. The air around a grimmlet, however, mutters and whispers at all times in a foul-sounding invocation. When the creature uses its innate magic, these whispers rise in volume slightly, giving canny listeners a split-second warning that something, likely unpleasant, is about to occur.

Grimmlet

Tiny monstrosity, unaligned
Armor Class 11
Hit Points 52 (15d4 + 15)
Speed 0 ft., fly 30 ft. (hover)
STR DEX CON INT WIS CHA
8 (−1) 12 (+1) 13 (+1) 3 (−4) 10 (+0) 14 (+2)

Damage Immunities psychic
Damage Resistances bludgeoning, piercing, and slashing from nonmagical weapons.
Condition Immunities blinded, charmed, deafened, petrified, poisoned, stunned, unconscious
Senses blindsense 60 ft., passive Perception 10
Languages
Challenge 1/2 (100 XP)

Innate Spellcasting. The grimmlet’s innate spellcasting ability is Charisma (spell save DC 12). It can innately cast the following spells, requiring no material components:
At will: crushing curse, minor illusion
3/day each: maddening whispers

Reproduce. If the grimmlet is dealt damage by a spell that does not reduce it to 0 hit points, a number of new grimmlets equal to the level of the spell slot used to cast the spell are created in the nearest empty spaces to the injured grimmlet. If the grimmlet is injured by a spell cast using innate spellcasting, the number of new grimmlets created is equal to the level of the spell cast. Grimmlets injured by cantrips or at-will innate spells create one new grimmlet.

Sixteen or more grimmlets within 30 feet of each other become a grimmlet swarm.

Actions

Crystal Edge. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) slashing damage and an additional 1 psychic damage.

Reactions

Self Destruct. When the grimmlet is reduced to 0 hit points, it explodes in a spray of void-infused crystal shards that deals 3 (1d6) slashing damage and 3 (1d6) psychic damage to all creatures within 5 feet of it. Creatures that make a DC 12 Dexterity saving throw avoid taking the slashing damage.

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