Reactive

You've trained considerably in being able to react to any situation with increased efficacy. You gain an additional reaction. You may use up to two reactions per round, but only one per turn. If an effect such as shield is cast on each reaction, the results of that spell or effect are additive for each use, so long as it doesn't conflict with any other feat, class feature, or mechanic.

Once this feature has been used, you may not do so again until- on a roll of a d6 at the beginning of your turn, you roll a 6.