Wali

Magic Resistance. The Wali has advantage on saving throws against spells and other magical effects. 

Mind Link. All the Guardians have a special mind link that connects them across the islands. They can communicate via this mind link as long as they are on the same plane.

Multi Attack: The Wali makes 2 claw attacks per turn. 

Claws Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4)  slashing damage.

Riua Protection of the Island Attack (Recharge on 5-6).  The Wali can create the Riua teleport ring. It can teleport any number of creatures that are a threat to its island. The Riua creates a 15-foot cube centered on any point Wali can see. All creatures with in the cube must make a DC 21 Dexterity saving throw, being sent to the town of Riua on the mainland on a fail.

The Wali can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Wali regains spent legendary actions at the start of its turn.

Claws Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4)  slashing damage.

Wing Attack. The Wali beats its wings. Each creature in a 10-foot radius of the Wali must succeed on a DC 19 Dexterity saving throw, taking 13 (2d6 + 6) bludgeoning damage and be knocked prone on a fail, or half damage and not being knocked prone on a success. The Wali can then fly up to half its flying speed.

Crystal Storm. A hail of crystal shards rise up from the ground in a 20-foot radius, 40-foot high cylinder centered on a point within range (120 feet). Each creature in the cylinder must make a DC 19 Dexterity saving throw. A creature takes 9 (2d8) bludgeoning damage on a failed save, or half as much damage on a successful one.