Time Parasite

Create a psychic link between you and a creature within range. If unwilling, the creature may make a Wisdom saving throw to ignore the effects of this spell, ending the spell. On a failed save or willing target, the target suffers the effects of a slow spell, while you gain the effects of a haste spell.

The target may make an additional saving throw at the end of each of their turns to end this effect. When the spell ends, you suffer the consequences of the haste spell ending as normal.