Armor Class 18 (natural armor)
Hit Points 39 (6d8 + 12)
Speed 40 ft., climb 40 ft., burrow 20 ft.
Senses darkvision 60 ft., tremorsense 60 ft., passive Perception 11
Languages Kruthik
Challenge 2
Keen Smell. The kruthik has advantage on Wisdom (Perception) checks that rely on smell.
Pack Tactics. The kruthik has advantage on an attack roll against a creature if at least one of the kruthik's allies is within 5 feet of the creature and the ally isn't incapacitated.
Tunneler. The kruthik can burrow through solid rock at half its burrowing speed and leaves a 5-foot-diameter tunnel in its wake.
Multiattack. The kruthik makes two stab attacks or two spike attacks.
Stab. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage.
Spike. Ranged Weapon Attack: +5 to hit, range 20/60 ft., one target. Hit: 5 (1d4 + 3) piercing damage.
Mordenkainen's Tome of Foes, p. 212