Bipedal speed: Griffins can walk at a speed of 20 feet when bipedal.

Fey born: Griffins count as fey for all purposes.

Four legged: Being a four legged creature, Griffins can bear greater weights (up to 50%) than a human of the same strength without being encumbered. Any roll to avoid becoming prone is made with advantage.

Flight: Griffins have feathered wings, and their base flying speed is 40 feet. They cannot fly if they are wearing armor they are not proficient in, armor not tailored to accommodate their wings, or a backpack not specially tailored to their wings. While flying, they have disadvantage on strength checks to interact with objects that are on the ground. They fall to the ground at the end of their turn unless they move at least half their flying speed during their turn.

Beak: Griffins gain a natural attack with their beak, it has the finesse property, and deals 1d6 piercing damage.

Cloud walker: Griffins can treat fog, mist, or any cloud as solid.

Air dominance: Griffins' affinity to the air reflects in the way they move and the magic they sling, bringing on the fury and kindness of the skies to others. When casting a spell that grants or denies flight or directly manipulates wind or electricity, they may, as a bonus action, enhance the spell as if they had cast it using a slot of one level higher without using that increased slot, up to a maximum slot they are normally capable of casting. When making an ability check related to an aerial stunt or resisting wind, they may double their proficiency bonus if they were already proficient.

Terrible claws: Griffins' claws, while sharp naturally, have been honed into true weapons fit for making anyone fearful to face them in martial combat. Their unarmed strikes deal 1d6 piercing or slashing damage. They gain a +1 to attack and damage with unarmed strikes. At level 5, their unarmed strike counts as magic. At level 10, their damage increases to 1d8 with their unarmed strikes.