Rend. If the drake hits a single target with both claw attacks on the same turn, the target takes an extra 29 (8d4 + 9) slashing damage.

Multiattack. The drake can use its Frightful Presence. It then makes two attacks, only one of which can be with its stinger.

Bite. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 16 (2d6 + 9) piercing damage.

Claw. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 14 (2d4+9) slashing damage.

Stinger. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 13 (1d6+9) piercing damage and the target must make a DC 16 Constitution saving throw, taking 24 (7d6) poison damage on a failed save, or half as much damage on a successful one.

Frightful Presence. Each creature of the drake's choice that is within 120 feet of the drake and aware of it must succeed on a DC 14 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns , ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the drake's Frightful Presence for the next 24 hours.

Shadowfire Breath (Recharge 6). The drake exhales dark flames in a 30-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw, taking 27 (6d8) fire damage and 27 (6d8) necrotic damage on a failed save, or half as much damage on a successful one.