The Lost Heterodoxy lexicon is a wide lexicon that is vaguely pentagonal in shape, with a flat tip and a small, semi-circular chunk taken out of the top and bottom of each cover.
Its border is indigo, and its covers are dominated by an abstract, green symbol with a white outline and a white circle in the center. This lexicon is only distinguishable from the Cursed Manual by its different color scheme.
A "heterodoxy" is a belief system that is different from the norm, but not heretical.
The Lost Heterodoxy has a simple combo that is very similar to many other of Zexion's weapons. The ground combo starts with a downward strike, followed by a slam to the left and right and ending with a forward toss.
In the aerial combo, Zexion will do a downward, then upward strike, then throw the Lost Heterodoxy in front of him.
| Annihilation | Energy Muzzle | Foxfire | Subzero | Hyperion | Lost Heterodoxy | King of the Night | Outbreak | Million Bucks | The Devil | Vindictive Thistle | Croix du Sud | Astral Blast|
Soul Eater+ | Mage's Staff+ | Knight's Shield+ | Kingdom Key D+ | Kingdom Key+