Crystal Crawler

False Appearance. While the crystal crawler remains motionless, it is indistinguishable from a crystalline formation.

Grappler. The crystal crawler has advantage on attack rolls against any creature grappled by it.

Crystalline Hide. The crystal crawler has a naturally hard back due to the crystalline growth on its back, which has an HP value of 8 and is immune to all forms of damage aside from bludgeoning, which it is vulnerable to. Once the crystal is broken the crystal crawler loses 4 AC. However it can eat minerals and rocks to regrow its crystal over the span of a day. Once the crystal is regrown the crystal crawler regains its normal AC value.

Claw. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 5 (1d8 + 1) slashing damage.

Bite. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Acid Spit. Ranged Weapon Attack: +2 to hit, reach 30 ft., one target. Hit: 7 (2d6 + 1) acid damage.