Dive Attack: If the Royal Griffin dives 30 ft. straight toward a target it deals an additional 10 (2d8) damage.

Flyby: The Royal Griffin does not provoke attacks of opportunity when it flies out of reach.

Keen Sight: The Royal Griffin has advantage on Wisdom (Perception) checks using Sight. 

Multiattack. The Royal Griffin can do two attacks: one with its beak and one with its talons.

Beak. Melee  weapon attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8+4) piercing

talons. Melee weapon attack: +7, to hit, reach 5 ft., one target. Hit: 11 (2d6+4) slashing. If the Royal Griffin hits with its Talons attack it can attempt to grapple the target as a bonus action. The target must make a DC 13 Strength save or be grappled by the Griffin. The target is grappled and the Griffin is not impaired by the added weight. The Griffin won’t be able to use its talons if it is currently holding a creature.

Wing swipe. +7, reach 10 ft., multiple targets. Hit: 15 (2d8+6) bludgeoning, target must make a DC DEX save of 12 or be knocked 10 ft back and prone

Stunning  Screech. Once per long rest, the royal griffin emits a powerful screech. Each creature within 40 feet of it that can hear it must succeed on a DC 16 Constitution saving throw or be stunned until the end of the griffin's next turn.

Call. It can be called to its master using a horn.