Until you end this stance, your attack spells achieve a critical hit on each natural roll of 18-20. You may end this stance as an immediate interrupt when you would miss one or more targets with a spell to re-roll each attack check that you do not like. You must use the second set of rolls, even if some of them are lower.
At each even level, you choose a new at-will Metamagic. You may choose maneuvers from this class feature or any of your other class features.
At each odd level, you choose a new class feature. Some class features allow you to choose one or more ranked Metamagic; you may choose ranked Metamagics from this class feature or any of your other class features.
As you enter this stance, choose up to three metamagic stances that you know whose total ranks are less than the per-encounter feat rank expended to perform this metamagic. Until you end this stance, you gain the benefit of each of those stances.