Avalanche Stomp

At 14th level, you become as mighty as an unstoppable
glacier. As an action, you can stomp the ground to send out
a magical tremor. All creatures of your choice within 15 feet
of you must make a Dexterity saving throw (DC 8 + your
proficiency bonus + your Strength modifier). On a failed
save, a creature takes bludgeoning damage equal to 3d6 +
your Strength modifier and is knocked prone. If you use this
feature while you’re raging, your rage is maintained until the
end of your next turn.