When an individual within range is targeted by an attack, you can use this spell as a reaction to impose disadvantage on the incoming attack. You must use this reaction before the attack is determined to be successful or not (ie before the result of the die roll is announced). Alternatively, when an individual is struck by an effect that requires a saving throw and the target fails their saving throw, you can use this spell to grant an additional d20 die roll to the affected creature, potentially turning a fail into a success.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, it becomes a concentration spell. For each level above 1st level, you can affect one additional attack or saving throw within a minute of the initial cast.
* - When a creature makes an attack or an ally fails a saving throw
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