Quicken

Transmutation cantrip (temporal)

Casting Time: 1 action
Range: Touch
Components: V, S
Duration: Concentration, up to 1 minute

You touch one willing creature. Once before the spell ends, the target can roll a d4 and add the number rolled to its next initiative roll or Dexterity saving throw. The target can roll the die before or after the d20 roll. The spell then ends.