Otherworldly Gray Gryphon

Traits

Life Bond. When you regain Hit Points from a level 1+ spell, the gryphon regains the same number of Hit Points if you're within 5 feet of it.

Heightened Senses. While riding the gryphon, the rider has Advantage on Wisdom (Perception) checks that rely on sight or hearing.

Shared Ward. Requires a level 5+ spell. While riding the gryphon, its rider also has Resistance to Lightning damage.

Greater Ward. Requires a level 7+ spell. The gryphon has Immunity to Lightning damage rather than Resistance, and its rider shares that Immunity while riding the gryphon.

Actions

Talons. Melee Attack Roll: Bonus equals its Strength modifier plus your Proficiency Bonus, reach 5 ft. Hit: 1d8 + its Strength modifier Slashing damage. If the target is a Large or smaller creature, it is subjected to the following effect. Dexterity Saving Throw: DC 10 + the spell's level. Failure: The target has the Grappled condition (escape DC 10 + the spell's level).

Lightning Breath (1/Day). Requires a level 4+ spell. Dexterity Saving Throw: DC 10 + the spell's level, each creature in a 30-foot-long, 5-foot-wide Line. Failure: A number of d8s equal to the spell's level Lightning damage. Success: Half damage.