Nanite Ward

Someone casted Rapid Response Nanites on you

You are infused with self-defense nanites. The ward lasts until the caster of this ability finishes a long rest or until the caster uses this feature again.   The ward is represented by a number of d8s equal to the number of nanite points spent to create it. When the warded creature takes damage, it can expend a number of those dice, roll them, and reduce the damage taken by the total rolled on those dice.