Timeflex

When a creature (including yourself) takes a turn within range, you pull out your time piece and turn back the time. Everything that happened during the creature's turn is erased. Only you remember the results of the original turn. You may then choose as a free action to influence the outcome of the repeat turn. If a creature made an attack as a part of the original turn, you can warn the target, giving them an edge against the attack and forcing Disadvantage on any attack against them for the repeated turn. If a creature failed a saving throw or ability check, you can redirect them, giving them Advantage for the repeat turn. If a hostile creature succeeded against a spell from another creature, you can distract them, giving them Disadvantage for the repeat turn for any spell cast on them. And so on. You may only effect one creature's outcome in this way for the repeat turn (including yourself).