Geekend - Kingmaker
Torg's transformative polearm
Nettle’s Wrath is a +1 ranseur that can change its shape at its wielder’s command (a standard action) to become any other Medium-sized polearm (i.e., from the Polearms weapon group). If dispelled, it reverts to its original ranseur form.
It essentially has the transformative weapon property from the APG, but limited to Medium-sized polearms and it doesn’t revert when not wielded.