Ankheg Brood Queen

Lay Egg. As a bonus action, the brood queen can lay an egg that contains an ankheg broodling. The egg appears in the nearest space within 5 feet of the brood queen. The egg has an of AC 5 and has 5 hit points. At the end of the brood queen's next turn, the ankheg broodling can use a bonus action to break out of its egg and immediately move and attack the nearest creature that isn't an ankheg.

Burst Forth (Recharges after a Short or Long Rest). As a bonus action, the brood queen breaks through solid ground or wall, showering the area with debris. Each creature within 15 feet of the brood queen must succeed on a DC 17 Strength saving throw, 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 5 ft., one target. Hit: 20 (4d6+6) slashing damage plus 7 (2d6) acid. If the target is a Huge or smaller creature, it is grappled (escape DC 16). Until this grapple ends, the brood queen 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.

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.

Acid Spray (Recharge 5–6). The brood queen spits acid in a line that is 60 feet long and 5 feet wide. Each creature in that line must succeed on a DC 14 Dexterity saving throw, taking 28 (8d6) acid damage on a failed save, or half as much damage on a successful
one.