Mass Polymorph Arcane Eye may earn a small commission from affiliate links in this article. Learn more. 9th level Transmutation Is Mass Polymorph Good? Overall Rating: Sky Blue. This means that Mass Polymorph is an amazing spell. If you do not take this spell your character would not be optimized. Overall Notes: Take up to 10 creatures out of the fight or turn your entire party into T-rexes.