Power strike is granted to knights and slayers through the Power Strike class feature. They gain additional uses of the power through the improved power strike class feature at levels 3, 11 (requires paragon path), and 13. At level 20, Stalwart Knights can slight targets of Power attack 1 square (or one additional square). Eldritch Knight can teleport themselves and the target 5 squares (but not into hindering terrain). The March 2011 update changed both versions of power strike to no action instead of free action, to prevent conflicts with the one free action attack per turn limit.[U]