From Pathfinder Dark Archive (Remastered), which isn't enabled.

Malleable Form

FEAT 13

Activity 1 action

Prerequisites ability to cast at least one polymorph spell

Requirements You're polymorphed by a spell that has multiple choices of battle form.

You adroitly shift your form, taking on another appearance. Choose a different battle form of the polymorph spell affecting you, and change to that form instead of the current one. This destabilizes the spell's magic, reducing its duration by 1 round. Use the rank of the spell to determine the statistics, as normal.

Pathfinder Dark Archive (Remastered)ORC