Shapechange

Casting Time: 1 action
Range: Self
Duration: Concentration, up to 1 hour
You assume the form of a different creature for
the duration. The new form can be any creature
with a challenge rating equal to your level or
lower. You transform into an average example
of that creature, one without any class levels or
the Spellcasting trait.
See PHB, pg. 274.