Gorethak the Ruinborn – DnD Boss Monster

Something ancient has clawed its way up from the depths of the earth and it's not going back.

Gorethak the Ruinborn is a massive, armored monstrosity built for the tabletop. 

Every ridge of his stone-grey scales, every jagged dorsal plate, every crumbling rock at his feet tells the story of a creature that has survived ages of war, ruin, and devastation. He doesn't just enter the scene, he IS the scene.

Whether he's the final boss of a catastrophic dungeon arc, a legendary encounter your players will talk about for years, or simply the most intimidating piece on your shelf, Gorethak commands attention the moment he hits the table.

Print him. Fear him. Fight him.

DM QUICK REFERENCE

GORETHAK THE RUINBORN
Huge Monstrosity, Chaotic Evil

Armor Class: 17 (Natural Armor)
Hit Points: 230 (20d12 + 100)
Speed: 40 ft.

STR 26 (+8) | DEX 9 (-1) | CON 21 (+5) | INT 6 (-2) | WIS 10 (+0) | CHA 7 (-2)

Saving Throws: STR +12, CON +9
Skills: Perception +4, Athletics +12
Damage Resistances: Bludgeoning, Piercing, Slashing from non-magical attacks
Damage Immunities: Poison
Condition Immunities: Frightened, Poisoned
Senses: Darkvision 90 ft., Tremorsense 30 ft., Passive Perception 14
Challenge: 14 (11,500 XP)

TRAITS

Ruinborn Resilience. When reduced to 0 HP for the first time, Gorethak drops to 1 HP instead and gains immunity to all damage until the start of his next turn.
Tremor Step. When Gorethak moves at least 20 ft., each creature on the ground within 10 ft. must succeed on a DC 17 STR save or be knocked prone.

ACTIONS 

(Multiattack: 3 attacks.1 Bite, 2 Claws)
Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 25 (3d10+8) piercing damage. Target is grappled (escape DC 18).
Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 20 (2d10+8) slashing damage.
Ruinous Slam (Recharge 5-6). Gorethak slams the ground. Each creature within 20 ft. must make a DC 17 DEX save or take 45 (10d8) bludgeoning damage and be stunned until end of their next turn (half damage on success, not stunned).

LEGENDARY ACTIONS

(3/round, at end of another creature's turn)
Detect. Makes a Perception check.
Claw Strike (1 action). Makes one Claw attack.
Earthquake Roar (2 actions). All creatures within 30 ft. must succeed on a DC 15 WIS save or be frightened until end of their next turn.