b'Death Butterfly Swarm \n'b'  Family:   Insects Rodents &amp; Vermin  \n'b'  Large  swarm of Tiny  beasts ,  unaligned  \n'b'  Armor Class  15 (natural armor)  Hit Points  60 (11d10)  Speed  5 ft., fly 40 ft. (hover)\n'b' STATS STR: 1 (-5) DEX:  14 (+2)  CON:  10 (+0)  INT:  1 (-5)  WIS:  12 (+1)  CHA:  12 (+1)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Damage Vulnerabilities  cold, fire  Damage Resistances  bludgeoning, piercing, slashing  Condition Immunities   charmed ,  frightened ,  grappled ,  paralyzed ,  petrified ,  poisoned ,  prone ,  restrained ,  stunned   Senses   darkvision  60 ft., passive  Perception  11  Languages  \xe2\x80\x94  Challenge  4 (1,100 XP)  Proficiency Bonus  +2 \n'b' SPECIAL TRAITS \n'b'\n'b'  Potent Poison . Undead with  resistance  or immunity to poison damage or the  poisoned  condition can be affected by the swarm\xe2\x80\x99s poison. \n'b'  Swarm . The 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 insect. The swarm can\xe2\x80\x99t regain  hp  or gain  temporary hp . \n'b'  Weight of Wings . A creature that starts its turn in the swarm\xe2\x80\x99s space has its speed halved and must succeed on a DC 12  Dexterity  saving throw or become  blinded . Both effects end when the creature ends its turn outside the swarm\xe2\x80\x99s space. On a successful saving throw, the creature is immune to the blinding effect of Weight of Wings for the next 24 hours. \n'b'\n'b' ACTIONS \n'b'\n'b'  Bites .  Melee Weapon Attack : +4 to hit, reach 0 ft., one creature in the swarm\xe2\x80\x99s space.  Hit : 21 (6d6) piercing damage, or 10 (3d6) piercing damage if the swarm has half of its  hp  or fewer. The target must make a DC 12  Constitution  saving throw. On a failure, it takes 10 (3d6) poison damage and is  poisoned  until the end of its next turn. On a success, it takes half the damage and isn\xe2\x80\x99t  poisoned . \n'b'\n'b' ABOUT \n'b' Enormous clouds of orange and green butterflies add a reek of putrefaction to the air, stirred by the flapping of delicate wings. \n'b'  Demon-Haunted . A death butterfly swarm results when a rare breed of carrion-eating butterfly, drawn en masse to the stench of decay, feeds on the corpse of a fiend, demon, or similar creature. \n'b'  Dizzying and Poisonous . The colorful, chaotic flapping of the insects\xe2\x80\x99 wings blinds and staggers those in its path, allowing the swarm to necrotize flesh from those it overruns. Attracted to rotting material, the swarm spreads a fast-acting, poison on its victims, creating carrion it can feed on immediately. \n'b'  Devour the Undead . Undead creatures are not immune to a death butterfly swarm\xe2\x80\x99s poison. A swarm can rot an undead creature\xe2\x80\x99s animating energies as easily as those of the living. \n'b' Given the choice between an undead and living creature, a death butterfly swarm always attacks the undead, finding ghouls and  vampires  particularly appealing. Some good-aligned forces regard summoning these swarms as a necessary evil.'