Threads of fate

Once using this spell you can magically alter the triggering creatures trajectory or bolster an ally and turn a fleeting moment to either assist or deter. This spell can either be used as an action or reaction. If used as an action the target(s) either gain advantage or disadvantage on their next : check, attack roll or save. If used as a reaction the triggering creature must reroll the d20 , if triggered by an ally use the higher roll, if triggered by an enemy take the lower roll, multiple targets cannot be targeted when using it as a reaction.

Using a Higher-Level Spell Slot. You can target one additional creature for each spell slot level above 1.