Ankheg Queen

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 16 (2d10 + 5) slashing damage plus 9 (2d6) acid damage. If the target is a Huge or smaller creature, it is grappled (escape DC 15). Until this grapple ends, the Ankheg Queen can bite only the grappled creature and has advantage on attack rolls to do so.

Acid Spray (Recharge 4-6). The Ankheg Queen 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 15 Dexterity saving throw, taking 21 (6d6) acid damage on a failed save, or half as much damage on a successful one.

Brood Queen (Recharge 6). The Ankheg Queen shoots an egg in a range of 40/80 feet. Upon contact with a creature the egg will explode in a radius of 10 feet. Each creature within this area must make DC 15 Dexterity saving throw, taking 25 (5d8) acid damage and being restrained by the slime of the egg on a failed save, or half as much damage and being in difficult terrain on a successful one. 

Queen of the Nest (Recharge 5-6). The Ankheg Queen will immediately burrow 20 feet underground.