thirdtofifth:

Bleakborn
Medium undead, neutral evil
Armor Class 15 (natural armor)
Hit Points 120 (16d8 + 48)
Speed 30 ft.
Str 21, Dex 16, Con 17, Int 14, Wis 14, Cha 15
Damage Immunities fire, poison
Damage Resistances necrotic
Condition Immunities poisoned
Senses darkvision 60 ft. passive Perception 12
Languages one language it knew in life
Challenge 7 (2900 XP)
Heat-Draining Aura. A creature that starts its turn within 15 feet of the bleakborn takes 5 points of cold damage, and the bleakborn regains hit points equal to the damage taken. A humanoid creature that dies while within 15 feet of the bleakborn rises 24 hours later as a zombie under the bleakborn’s control, unless the humanoid is restored to life or its body is destroyed. The bleakborn can have no more than twelve zombies under its control at one time.
Actions
Multiattack. The bleakborn makes two slam attacks.
Slam. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 8 (1d6+5) bludgeoning damage plus 7 (2d6) cold damage.

Appearing as a gaunt walking corpse with patches of ice across its rotted skin, bleakborn feast on the body heat of living creatures. Too long without it, and they go dormant, appearing to be nothing but a dead body until a living creature comes within 15 feet of it: at which point it awakens, hungry for the creature’s heat. Bleakborn raise those they kill as zombies, helping them defend their lairs. Bleakborn are created when humanoids die in bitterly cold conditions, either freezing to death or in some other way. They stand a little over six feet tall and weigh between 150 and 230 pounds.

Originally from Libris Mortis: The Book of Undead. A request from

viandemoisie.  If there is a monster from 3.5 or Pathfinder that you want to see converted to 5e, feel free to send me a message or submit a monster request on the submit page.