Undying (5e Creature)
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Medium undead, neutral evil
Saving Throws Dex +7, Wis +8
Magic Resistance. The undying has advantage on saving throws against spells and other magical effects.
Undead Fortitude. If damage reduces the undying to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the undying drops to 1 hit point instead.
Multiattack. The undying makes two attacks.
Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) slashing damage plus 10 (3d6) necrotic damage.
Necrotic Blast. Ranged Spell Attack: +8 to hit, range 120 ft., one target. Hit: 10 (3d6) necrotic damage.
Necrotic Shield. The undying adds 5 to its AC against one attack that would hit it. To do so, the undying must see the attacker.
Undying are undead warriors created by depraved spellcasters through profane rituals. The magic used to create undying only works on a willing humanoid, granting it unlife and great power at the cost of eternal servitude to the being that created it, who can also end the undying's existence at any time.
Willing Servants. Because undying can only be created from willing humanoids, they are quite rare. Most undying hail from the ranks of cults dedicated to the proliferation of undeath, but others were disgraced knights seeking to spite their former allies, criminals seeking protection from the law; trading freedom of spirit for freedom of body, or those seeking vengeance against an individual or group at any cost.
Undead Nature. An undying doesn't require air, food, drink, or sleep.