Ankheg

Large Monstrosity, Unaligned

STR
17 (+3)
DEX
11 (+0)
CON
14 (+2)
INT
1 (-5)
WIS
13 (+1)
CHA
6 (-2)
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 Roll: +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.

Find this creature in the encounter builder

Ankheg

Source: Stranger Things: Welcome to the Hellfire Club, p. 18 - Licenses and attribution