Crystal Bound Quetzalcoatlus

Dive Attack. If the quetzalcoatlus is flying and dives at least 30 feet toward a target and then hits with a bite attack, the attack deals an extra 10 (3d6) damage to the target.

Flyby. The quetzalcoatlus doesn’t provoke an opportunity attack when it flies out of an enemy’s reach.

Dive Bomb.  If the quetzalcoatlus is flying and dives at least 30 feet toward a target and has less then 20 hit points it explodes thus destroying itself. Each creature within 20 feet of the quetzalcoatlus must make a Dexterity saving throw 17. On a failed save, the creature takes 4d6 thunder damage and 4d6 lightning damage, or half as much on a successful save. 

Crystal Bound. The Quetzalcoatlus can not betray the bearer of it's crystal powers, thus is immune to effects that would allow it to attack or interact differently towards Crystals Druids or Crystal Soldiers.

Crystal Power. Magical power that comes from crystals forming unnaturally on the body of the host. This power can vary based on what plane it comes from. (This can be changed up to the DM's requirements)

Bite. Melee Weapon Attack: +4 to hit, reach 10 ft., one creature. Hit: 12 (3d6 + 2) piercing damage and 1d8 lightning damage.

Crystal Thunder Wing (Recharge 5-6). Each creature in a 15-foot cube originating from you must make a Constitution saving throw. On a failed save, a creature takes 3d8 thunder damage and is pushed 10 feet away from you. On a successful save, the creature takes half as much damage and isn't pushed. In addition, unsecured objects that are completely within the area of effect are automatically pushed 10 feet away from you by the spell's effect, and the spell emits a thunderous boom audible out to 300 feet.

Crystal Bolt (Recharge 8). A stroke of lightning forming a line 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 8d6 lightning damage on a failed save, or half as much damage on a successful one. The lightning ignites flammable objects in the area that aren't being worn or carried.

Crystal Absorption Empowerment (3 charges per Long Rest). When hit by an attack that deals acid, cold, fire, lightning, or thunder damage. The quetzalcoatlus can absorb a portion of that damage, thus gaining resistance to that damage until the start of it's next turn and heal itself in the process. Reduce the triggering damage by half due to the gained resistance, then roll a d12 for every two damage dice and have hit points healed by that amount.