Crockoid

Undead Nature

The Crockoid doesn't require air, food, drink, or sleep.

 Turn Resistance

The Crockoid has advantage on saving throws against any effect that turns undead.

 Rocky Shell

The Crockoid begins combat encased within a magically reinforced shell formed from stone, concrete, timber, or other durable materials. While the shell remains intact, it gains the following benefits:

• Its Armor Class becomes 21.
• Its speed becomes 20 feet.
• It has resistance to bludgeoning, piercing, and slashing damage.
• It is immune to the grappled, prone, and restrained conditions.
• It can use only its Shell Slam and Rolling Crush attacks.

When the Crockoid is reduced to 97 hit points or fewer, the shell violently shatters.

Each creature within 10 feet of the Crockoid must succeed on a DC 16 Dexterity saving throw or take 10 (3d6)bludgeoning damage from flying debris, or half as much damage on a successful save.

After the shell shatters, the Crockoid immediately regains its normal speed, loses the benefits of this trait, and gains access to its Exposed Form attacks.

 False Boulder

While motionless with its shell intact, the Crockoid is indistinguishable from an ordinary boulder. A creature that carefully examines it can determine its true nature with a successful DC 20 Wisdom (Perception) or Intelligence (Investigation) check.

Multiattack

Shell Intact. The Crockoid makes one Shell Slam attack.

Shell Shattered. The Crockoid makes three Golden Claw attacks.

Shell Intact

 Shell Slam

Melee Weapon Attack: +10 to hit, reach 5 ft., one target.

Hit: 24 (4d8 + 6) bludgeoning damage.

Rolling Crush (Recharge 5–6)

The Crockoid curls into its shell and rolls up to 50 feet in a straight line.

It can move through the spaces of Medium or smaller creatures.

Each creature whose space it enters must make a DC 18 Dexterity saving throw.

On a failed save, the creature takes 27 (6d8) bludgeoning damage, is knocked prone, and is pushed into the nearest unoccupied space adjacent to the Crockoid's path.

On a successful save, the creature takes half as much damage and isn't knocked prone or pushed.

Exposed Form

 Golden Claw

Melee Weapon Attack: +10 to hit, reach 5 ft., one target.

Hit: 15 (2d8 + 6) slashing damage plus 7 (2d6) necrotic damage.

Deathless Frenzy (Recharge 5–6)

The Crockoid moves up to half its speed without provoking opportunity attacks.

It may make one Golden Claw attack against up to three different creatures it moves adjacent to during this movement.

Relentless Advance

The Crockoid moves up to half its speed.

Grim Persistence

When the exposed Crockoid is reduced to 0 hit points, it can make one Golden Claw attack before falling inert. Once it uses this reaction, it can't use it again.