Phantom Steed

Source phantom steed

The steed's rider automatically succeeds at Ride checks to remain mounted. The mount's hit points increase to 10 plus 2 per caster level, and its speed increases to 30 feet per 2 caster levels (maximum 150 feet).

Augmented (3rd): If you expend two uses of mythic power, the phantom steed is incorporeal, but its rider can interact with it normally.