Ankheg

AC 14     Initiative +0 (10)
HP 45 (6d10 + 12)
Speed 30 ft., Burrow 10 ft.

Ability Scores
STR 17 (+3) Save +3    DEX 11 (+0) Save +0    CON 14 (+2) Save +2
INT 1 (−5) Save −5    WIS 13 (+1) Save +1    CHA 6 (−2) Save −2

Senses Darkvision 60 ft., Tremorsense 60 ft.; Passive Perception 11
Languages None
CR 2 (XP 450; PB +2)

Traits
Tunneler. The ankheg can burrow through solid rock at half its Burrow Speed and leaves a 10-foot-diameter tunnel in its wake.

Actions
Bite. Melee Attack: +5 (with Advantage if the target is Grappled by the ankheg), reach 5 ft. Hit: 10 (2d6 + 3) slashing damage plus 3 (1d6) acid damage. If the target is a Large or smaller creature, it has the Grappled condition (escape DC 13).

Acid Spray (Recharge 6). Dexterity Saving Throw: DC 12, each creature in a 30-foot-long, 5-foot-wide line. Failure: 14 (4d6) acid damage. Success: Half damage.