b'Grimmlet Swarm \n'b'  Large   swarm  of Tiny monstrosities,  unaligned  \n'b'  Armor Class  15 (natural armor)  Hit Points  152 (16d10 + 64)  Speed  0 ft., fly 30 ft. (hover)\n'b' STATS STR: 17 (+3) DEX:  12 (+1)  CON:  19 (+4)  INT:  3 (-4)  WIS:  10 (+0)  CHA:  18 (+4)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'     Damage Resistances  bludgeoning, piercing, slashing  Damage Immunities  psychic  Condition Immunities   blinded ,  charmed , deafened,  frightened ,  grappled ,  paralyzed ,  petrified ,  poisoned ,  prone ,  restrained , stunned  Senses   blindsight  120 ft., passive  Perception  10  Languages  understands Void Speech but can\xe2\x80\x99t speak  Challenge  14 (11,500 XP) \n'b' Special Traits \n'b'   Enervating Maelstrom . When the grimmlet swarm dies, it explodes in a plume of ennui. Each creature within 20 feet of the grimmlet swarm must make a DC 17  Dexterity  saving throw. On a failure, a creature takes 21 (6d6) psychic damage and suffers one level of  exhaustion . On a success, a creature takes half the damage and doesn\xe2\x80\x99t suffer  exhaustion . Grimmlets damaged by this trait don\xe2\x80\x99t Reproduce. \n'b'  Maze of Edges . A creature that attempts to move out of or through the grimmlet swarm must succeed on a DC 15  Dexterity  saving throw or take 9 (2d8) slashing damage. \n'b'  Reproduce . When a grimmlet swarm takes damage from a spell and isn\xe2\x80\x99t reduced to 0  hp , a number of new grimmlets equal to the spell\xe2\x80\x99s level appear in unoccupied spaces within 10 feet of the grimmlet swarm. If the spell is a cantrip, only one grimmlet is created. New grimmlets aren\xe2\x80\x99t subsumed into the swarm. Sixteen or more new grimmlets within 30 feet of each other can use their  reactions  to come together and form a new grimmlet swarm in a space within 5 feet of one grimmlet. \n'b'  Swarm . The grimmlet swarm can occupy another creature\xe2\x80\x99s space and vice versa, and the swarm can move through any opening large enough for a Tiny grimmlet. The swarm can\xe2\x80\x99t regain  hp  or gain  temporary hp . \n'b'  Innate Spellcasting (Psionics) . The grimmlet swarm\xe2\x80\x99s innate spellcasting ability is  Charisma  (spell save DC 17, +9 to hit with spell attacks). It can innately cast the following spells, requiring no components:\n'b'\n'b'   At will :  color spray , eldritch blast (3 beams),  minor illusion  \n'b'  3/day each :  hypnotic pattern ,  lightning bolt ,  major image  \n'b'  1/day each :  hallucinatory terrain  \n'b'\n'b'  Actions \n'b'   Multiattack . The grimmlet swarm makes two attacks with its crystal edges. \n'b'  Crystal Edges .  Melee Weapon Attack : +8 to hit, reach 0 ft., one creature in the swarm\xe2\x80\x99s space.  Hit : 18 (4d8) slashing damage, or 9 (2d8) slashing damage if the swarm has half of its  hp  or fewer. The target must make a DC 17  Intelligence  saving throw, taking 21 (6d6) psychic damage on a failed save, or half as much damage on a successful one.'