Adamantine Taint (5e Creature)
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Medium construct, unaligned
Damage Resistances fire
Immutable Form. The adamantine taint is immune to any spell or effect that would alter its form.
Magic Resistance. The adamantine taint has advantage on saving throws against spells and other magical effects.
Magic Weapons. The adamantine taint's weapon attacks are magical.
Multiattack. The adamantine taint makes two melee attacks.
Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage. If the target is a creature, it must succeed on a DC 13 Constitution saving throw or be restrained for 1 minute as metal spreads over its skin. An affected creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Adamantine taints are constructs made from humanoids imbued with tough metal. If any part of an adamantine taint is severed, it reverts to flesh instantly, and when it dies, the humanoid can be restored to life normally. Adamantine taints have a number of inherent abilities normally found only in more powerful constructs, such as greater resilience in the face of magical onslaught and outright immunity to mundane weapons.
Metallic Touch. The touch of an adamantine taint causes dull metal to creep over a creature's skin. The metal flakes off shortly afterwards, unless the creature dies while the metal remains, in which case the metal permanently covers the creature's skin, unless it is restored to life, in which case the metal flakes off the instant it is brought back to life. Humanoids slain by adamantine taints are slowly affected by the magic that animated the original, transforming the humanoid into a new adamantine taint.
Powerful Guardians. Adamantine taints are excellent guards for treasure, as they are unwavering in their vigil, ignoring bribes and threats. Rituals known to the mightiest of spellcasters can infuse a metal object with the magic required to transform living humanoids into adamantine taints, so some place worthless objects so affected and disguised with other magic in their vaults, luring unwary thieves and looters into protecting the treasure they sought to plunder.
Constructed Nature. An adamantine taint doesn't require air, food, drink, or sleep.