Ankhrav

Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 18 (2d8 + 8) slashing damage plus 6 (2d6) acid damage. If the target is a Large or smaller creature, it is grappled (escape DC 16). Until this grapple ends, the ankhrav can bite only the grappled creature and has advantage on attack rolls to do so.

Acid Spray (Recharge 6). The ankhrav spits acid in a line that is 60 feet long and 10 feet wide, provided that it has no creature grappled. Each creature in that line must make a DC 15 Dexterity saving throw, taking 24 (7d6) acid damage on a failed save, or half as much damage on a successful one. Once an ankhrav uses this ability, the ankhrav's bite attack is reduced by 1d6 for 1 hour. If the bite attack would not deal any acid damage, it cannot spit acid.