Burst Forth (Recharges after a Short or Long Rest). The brood queen breaks through solid ground or wall as a bonus action, showering the area with debris. Each creature within 15 feet of the brood queen that is surprised must succeed on a DC 17 Strength check, taking 20 (4d6 + 6) bludgeoning damage and is knocked prone on a failed save, or half as much damage and isn't knocked prone on a successful one.
Multiattack. The brood queen makes two melee attacks: one with its bite and one with its claws.
Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 20 (4d6 + 4) slashing damage plus 7 (2d6) acid damage. If the target is a Large or smaller creature, it is grappled (escape DC 17). Until this grapple ends, the ankheg can bite only the grappled creature and has advantage on attack rolls to do so.
Claws. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 6) slashing damage.
Acid Spray (Recharge 5-6). The ankheg spits acid in a line that is 60 feet long and 5 feet wide, provided that it has no creature grappled. Each creature in that line must make a DC 14 Dexterity saving throw, taking 28 (8d6) acid damage on a failed save, or half as much damage on a successful one.
Command Ankhegs. The brood queen targets 1d4 ankhegs within 30 feet that can see and hear the brood queen. The target uses its reaction to make one melee attack or move up to its speed without provoking attacks of opportunity.
Comments