Whenever you cast or use an arcane polymorph spell, you can grant the target the ability to expend 1 minute of the spell's duration to assume another form allowed by the spell. Changing form in this way is a standard action. The target can assume another form as often as it likes for the duration of the spell. If you're the target, you can change forms as a swift action rather than a standard action. If you expend one use of mythic power when you cast the spell, you can also grant the target the ability to assume the shape of one specific individual that the spell could duplicate (for example, the target could use polymorph to assume the form of a specific animal, humanoid, or elemental, but not a dragon because dragon forms aren't allowed by polymorph). This specific creature must be known to you, but it doesn't have to be known by the target. The target gains a +10 bonus on Disguise checks to pass as that individual, but Bluff checks or knowledge of the individual might be required to make the disguise truly convincing.
