morph transmutation 

Traditions arcane, primal

Cast [>>] somatic, verbal

Range touch; Targets 1 willing creature

Duration 10 minutes

The target's feet transform into fins, improving mobility in the water but reducing it on land. The target gains a swim Speed equal to its normal land Speed, but its land Speed becomes 5 feet.

Heightened (6th) The spell lasts until the next time you make your daily preparations.

Core Rulebook, page 337.