Taxing Teleport

You may expend 1 hit point to teleport up to ten feet in any direction as a bonus action that you can take prior to or after an attack.

  If you wish to cast without expending the required hit points then you must make a constitution save of 10 DC.  For each additional 5 feet add 1 to the save DC (15 feet = 11 DC, 20 feet = 12 DC, and so on).  Maximum range that can be achieved is 60 feet.

  On a successful save you reach your destination intact. 

  On a failed save you take 1D4 force damage.   You only move 5 feet, are stunned until you make the constitution  save of 13DC or someone hits you, no bonus actions or reactions can be taken, and you fall prone.