b'Choromos Swarm \n'b'  Huge   swarm  of Medium fiends,  neutral evil  \n'b'  Armor Class  18 (natural armor)  Hit Points  299 (26d12 + 130)  Speed  20 ft., fly 50 ft. (hover)\n'b' STATS STR: 14 (+2) DEX:  23 (+6)  CON:  20 (+5)  INT:  16 (+3)  WIS:  19 (+4)  CHA:  21 (+5)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'     Saving Throws   Dexterity  +13,  Constitution  +12,  Intelligence  +10,  Wisdom  +11  Skills   Perception  +11,  Performance  +12  Damage Resistances  bludgeoning, piercing, slashing  Damage Immunities  poison  Condition Immunities   charmed ,  frightened ,  paralyzed ,  petrified ,  poisoned ,  prone ,  restrained , stunned  Senses   blindsight  60 ft. (blind beyond this radius), passive  Perception  21  Languages  Abyssal, Common, Infernal  Challenge  22 (41,000 XP) \n'b' Special Traits \n'b'   Deranged Hum . At the start of each of the choromos\xe2\x80\x99 turns, each creature within 5 feet of it takes 10 (3d6) psychic damage. Fiends are immune to a choromos\xe2\x80\x99 Deranged Hum. \n'b'  Magic Resistance . The choromos has advantage on saving throws against spells and other magical effects. \n'b'  Magic Weapons . The choromos\xe2\x80\x99 weapon attacks are magical. \n'b'  Swarm . The choromos can occupy another creature\xe2\x80\x99s space and vice versa, and the choromos can move through any opening large for a Medium fiend. The choromos can\xe2\x80\x99t regain  hit points  or gain  temporary hit points . \n'b'  Actions \n'b'   Multiattack . The choromos makes three Poisoned Claw attacks or two Screech attacks. \n'b'  Poisoned Claws .  Melee Weapon Attack : +13 to hit, reach 0 ft., one creature in the swarm\xe2\x80\x99s space.  Hit : 35 (10d6) slashing damage, or 17 (5d6) slashing damage if the swarm has half of its  hit points  or fewer. The target must make a DC 20  Constitution  saving throw, taking 18 (4d8) poison damage on a failed save, or half as much damage on a successful one. \n'b'  Screech .  Ranged Spell Attack : +12 to hit, ranged 120 ft., one target.  Hit : 45 (10d8) thunder damage and the target must succeed on a DC 20  Constitution  saving throw or be incapacitated until the end of its next turn. \n'b'  Maddening Cacophony  (recharge 5-6). The choromos\xe2\x80\x99 many voices rumble into a maddening semblance of harmony. Each creature within 30 feet of the choromos that can hear it must make a DC 19  Wisdom  saving throw. On a failure, a creature takes 70 (20d6) psychic damage and suffers one short-term madness. On a success, a creature takes half the damage and doesn\xe2\x80\x99t suffer a short-term madness.'