Flinthusk Earthborn (5e Creature)
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Medium undead, neutral evil
Damage Resistances Piercing and slashing from nonmagical attacks not made with silver weapons, bludgeoning, necrotic
Earth Penetration. The flinthusk can burrow through nonmagical, unworked earth and stone. While doing so, it disturbs the material but doesn't leave any sort of tunnel behind.
Sharp Body. The flinthusk's melee attacks deal 2d6 extra slashing damage (included in the attacks). Any creature that begins its turn grappling the flinthusk takes 6 (2d6) slashing damage.
Spider Climb. The flinthusk can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Stench. Any creature that starts its turn within 5 feet of the flinthusk must succeed on a DC 12 Constitution saving throw or be poisoned until the start of its next turn. On a successful saving throw, the creature is immune to the flinthusk's Stench for 24 hours.
Turning Defiance. The flinthusk and any regular flinthusks within 30 feet of it have advantage on saving throws against effects that turn undead.
Multiattack. The flinthusk makes two Bite attacks. It can substitute either one for a Rock attack.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) piercing damage + 6 (2d6) slashing damage.
Rock. Ranged Weapon Attack: +5 to hit, reach 20/60 ft., one target. Hit: 16 (3d8 + 3) bludgeoning damage.
Earth Tremor (Recharge 6). The flinthusk slams the ground with its fists, creating a miniature earthquake in a 40-ft. radius centered on itself. Every creature in that area must make a DC 16 Dexterity saving throw. On a failed save, a creature takes 32 (6d10) bludgeoning damage and is knocked prone. On a successful save, a creature takes half as much damage and isn't knocked prone. Damage inflicted by this attack is considered magical for the purposes of overcoming resistances and immunities.
A stronger breed of flinthusk, a flinthusk earthborn can only be created from a humanoid corpse that has been buried in stone rather than dirt. Its body seems to have absorbed the stones it rose from, making it even more jagged than a usual flinthusk. It can freely manipulate the stones on its deteriorated skin, allowing it to move through the ground like a giant drill bit. Flinthusk earthborns can even throw the stones off their bodies to attack, in addition to their deadly earthquake generation powers.
Undead Nature. A flinthusk earthborn doesn't require food, drink, air, or sleep.