b'Swarm of Death \n'b'  Gargantuan   swarm of Medium undead,  chaotic evil   \n'b'  Armor Class  18 (natural armor) \n'b' Hit Points  330 (20d20+120) \n'b' Speed  40 ft., climb 30 ft., swim 30 ft.\n'b' STATS STR: 19 (+4) DEX:  18 (+4)  CON:  23 (+6)  INT:  15 (+2)  WIS:  18 (+4)  CHA:  14 (+2)  \n'b'\n'b'\n'b'\n'b'\n'b'\n'b'\n'b'  Skills   Perception  +11,  Stealth  +18 \n'b' Damage Resistances  acid, fire, lightning, psychic, thunder; bludgeoning, piercing, slashing \n'b' Damage Immunities  cold, necrotic, poison \n'b' Condition Immunities   charmed ,  frightened ,  grappled ,  paralyzed ,  petrified ,  prone ,  restrained ,  stunned  \n'b' Senses   darkvision  120 ft., passive  Perception  21 \n'b' Languages  Common, Undercommon \n'b' Challenge  22 (41,000 XP) \n'b' SPECIAL TRAITS \n'b'\n'b'  Aura of Undeath . At the start of each of the swarm\xe2\x80\x99s turns, each creature within 15 feet of it takes 14 (3d8) necrotic damage. A creature that touches the swarm or hits it with a  melee attack  while within 15 feet of it takes 10 (3d6) necrotic damage. \n'b'  Magic Resistance . The swarm has advantage on saving throws made against spells and other magical effects. \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 Medium undead. The swarm can\xe2\x80\x99t regain  hit points  from spells or potions, and it cannot gain  temporary hit points . \n'b'  Turn Immunity . The swarm is immune to effects that turn undead. \n'b'\n'b' ACTIONS \n'b'\n'b'  Touch of Undeath .  Melee Weapon Attack : +11 to hit, reach 0 ft., any number of creatures in the swarm\xe2\x80\x99s space (make a separate  attack  roll for each).  Hit : 17 (2d12+4) slashing damage, or 10 (1d12+4) slashing damage if the swarm has half of its  hit points  or fewer. In addition, a target is  grappled  (escape DC 19) and takes 10 (3d6) necrotic damage. A target\xe2\x80\x99s hit point maximum is reduced by an amount equal to the necrotic damage taken, and the swarm regains  hit points  equal to that amount. The reduction lasts until a target finishes a long rest. A target dies if this effect reduces its hit point maximum to 0. \n'b'\n'b' LEGENDARY ACTIONS \n'b' The swarm can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature\xe2\x80\x99s turn. The swarm regains spent legendary actions at the start of its turn. \n'b'\n'b'  Attack . The swarm makes an  attack . \n'b'  Move . The swarm moves up to half its speed. \n'b'  Channel Negative Energy (Costs 2 Actions) . The swarm magically unleashes negative energy. Creatures within 60 feet of the swarm, including ones behind barriers and around corners, can\xe2\x80\x99t regain  hit points  until the end of the swarm\xe2\x80\x99s next turn. \n'b'\n'b' ABOUT \n'b' Battlefields littered with festering corpses and unblessed mass graveyards can spawn a horror that brings about more death than most conflicts manage in the first place. These shambling swarms of the undead have no purpose, no desires, and rarely any master other than a fundamental need to snuff out all that which lives.'