Mountain Quake
Level 14 Monk

Prerequisites: Mountain Stronghold

You stomp, shaking the earth beneath you. Creatures on the
ground within a 20-foot emanation take damage equal to your
Strength modifier (minimum 0), which they can resist with a
basic Fortitude save. On a failure, they also fall prone. After
you use this action, you can’t use it again for 1d4 rounds.
Special If you have this feat, the Dexterity modifier cap to
your AC while using Mountain Stance increases from +1 to +2.