Feat: The Harder They Fall (Kingmaker)

You know how to make a larger creature hurt when it falls to the ground. If you successfully Trip a foe that's larger than you, it takes 1d8 bludgeoning damage (or 2d8 bludgeoning damage on a critical success). If you are master in Athletics, the damage increases to 2d8 bludgeoning damage (or 4d8 bludgeoning damage on a critical success).