Also at 7th level, you learn how to use shift and open your Rift into place at just the right moment, allowing attacks to pass through it. You can use this feature a number of times equal to your Proficiency Bonus. You regain all expended uses when you finish a Long Rest, and you regain one expended use when you finish a Short Rest. You may also expend a spell slot of 2nd level or higher to use this feature without expending one of its uses.