Dissipate

 On a hostile creatures successful melee attack role against you, Dissipate can be cast as a reaction spell. Once cast the attacking hostile creature makes a DC (11, 13, 16, 19) Wisdom saving throw, if the creature fails they are tricked into believing they are actively being grappled by your character. On a successful save the creature ignores the grappled condition. At the end of the creatures turn they can re-roll the DC wisdom save throw 

At level 5 the Wisdom DC becomes 13, at level 9 it becomes Wisdom DC of 16, at level 16 the Wisdom DC becomes 19.