After you beat the White Bishop, you will be given a choice by the Diva of Twilight. If you choose to keep your wand, you will branch off into the "evil" storyline. If you choose to give up your wand, you branch off into the "good" storyline. Both with different endings.

Unlockable - How to Unlock

Bad Path - Keep you wand when asked by the Diva of Twilight.
Good Path - Give up your Wand when asked by the Diva of Twilight.