Animikii "Storm Bird" (Adult)

Dive Attack. If the Storm Bird is flying and dives at least 30 feet straight toward a target and then hits it with a melee weapon attack, the attack deals an extra 18 (4d8) damage to the target.

Keen Sight. The Storm Bird has advantage on Wisdom (Perception) checks that rely on sight.

Storm Cloak. While the Storm Bird is within fog or heavy rain any attacks have disadvantage to hit. 

Lightning Wreath. When the Storm Bird is struck with a melee attack, the attacker takes 8 (2d8) lightning damage and must succeed on a DC 14 Strength or Dexterity Saving Throw (creature's choice) or be knocked prone. 

Multiattack. The Storm Bird makes two attacks, one with either its gemstone claws or  hailstone beak and one electrocute attack. 

Gemstone Claws. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 11 (3d4 +4) piercing damage and 14 (3d6 + 5) lightning damage. If the target is a Medium or smaller creature, it is grappled (escape DC 14). Until this grapple ends, the target is restrained, and the Storm Bird cannot gemstone claws another creature. 

Hailstone Beak. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 7 (2d6 +4) piercing damage and 14 (3d6 +5) cold damage. 

Electrocute. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (3d6+ 5) lightning damage and make a DC 14 Strength saving throw or be stunned until the start of the Storm Birds next turn.