Multiattack. The elemental makes two claw and one bite attacks.

Claws. Melee Weapon Attack: +7 to hit, reach 10 ft., one creature. Hit: 11 (2d6 + 4) slashing damage. When this attack hits roll a DC 15 Dexterity or Strength saving throw or be knocked prone. 

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing. If the bite hits the target must make a DC 14 Con saving throw or be paralyzed until the end of the Wyvern's next turn.

Storm Breath (Recharge 5–6). The dragon exhales a storm of piercing cold wind in a 15­-foot line that is 5 feet wide. Each creature in that line must make a DC 15 Dexterity saving throw, taking (9) 3d6 lightning damage plus (6) 2d6 cold damage on a failed save, or half as much damage on a successful one.

Air Heal. Buff: Heal 10 hp while in the air