Flashstep Counter

Through conversing with a deity on the astral plane you gain a fraction of their power.  When another creature performs Flashstep, as a reaction, you may immediately perform Flashtep as well.

Sprint in a straight line faster than the eye can track from 10 feet up to 30 feet without provoking opportunity attacks.

While performing Flashtep, if you collide with an object or creature make a DC20 Strength or Dexterity saving throw. On a failed save, you take 2d10 (or 12) bludgeoning damage.  On a successful saving throw you take half.

You can perform this reaction a number of times equal to your proficiency bonus. You regain all expended uses when you finish a short rest.