Despark

You and 2 other creatures with spell slots may cast this spell on a target with a Planeswalker Spark. Once all 3 creatures are making physical contact with the target and begin to cast the spell, the target's movement speed becomes 0 and is unable to use Reactions. The 3 casters must then continue to concentrate on the spell by using their Action for one complete round, after which the Spark is torn from the target's being and dispersed into the Aether/Weave. Losing their Spark causes a creature to take force damage equal to half their maximum HP (rounded up), depletes half of their spell slots from every level (rounded down), and that creature's essence loses the Planeswalker quality.