polymorph transmutation 

Traditions arcane, primal

Cast [>>] somatic, verbal

Range 30 feet; Targets 1 willing creature

Duration 5 minutes

You warp space to make a creature smaller. The target shrinks to become Tiny in size. Its equipment shrinks with it but returns to its original size if removed. The creature's reach changes to 0 feet. This spell has no effect on a Tiny creature.

Heightened (6th) The spell can target up to 10 creatures.

Core Rulebook, page 369.