Mystic Arcanum-True Polymorph

Casting Time: 1 action
Range: 30 feet
Duration: Concentration, up to 1 hour
Choose one creature or nonmagical object that
you can see within range. You transform the
creature into a different creature, the creature
into a nonmagical object, or the object into a
creature. The transformation lasts for the
duration, or until the target drops to 0 hit points
or dies.
See PHB, pg. 283.