Armor Class 16 (natural armor)
Hit Points 82 (11d10 + 22)
Speed 30 ft., burrow 30 ft.
Damage Immunities fire, poison
Condition Immunities charmed, exhaustion, frightened, petrified, poisoned
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 10
Languages understands the languages of its creator but can't speak
Challenge 5
Fire Absorption. Whenever the ruin grinder is subjected to fire damage, it regains a number of hit points equal to half the fire damage dealt.
Siege Monster. The ruin grinder deals double damage to objects and structures.
Tunneler. The ruin grinder can burrow through solid rock at half its burrowing speed and leaves a 10-foot-diameter tunnel in its wake.
Multiattack. The ruin grinder makes two Excavator attacks.
Excavator. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) force damage. If the target is a Huge or smaller creature, it must succeed on a DC 17 Strength saving throw or be pushed up to 10 feet away and knocked prone.
SCC, p. 211