Illicit Research is shaped roughly like a semi-circle with a large, green diamond in the center of each cover, as well as two smaller ones on the spine. There is an oval chunk taken out of the top and bottom sides of both covers. Both the diamonds and the lexicon share a lilac-colored border, and the remaining sections of the book are light blue.
"Illicit" means "illegal" or "illegitimate". "Research" is an organized documentation of observations and examinations.
Illicit Research's normal ground combo consists of White Tome's a slash straight down with the spine up and a sweep from Zexion's upper right to lower left and back. The combo finisher has Zexion hover in the air slightly, throwing Illicit Research in front of him with one arm stretched forward. As the lexicon trembles, Zexion throws his arms wide and it opens up, expanding larger than Zexion with lush claws within that charges at the enemy ahead.
The aerial combo is identical, except for the fact that Zexion first jumps and thrusts the Illicit Research.
| Overlord | Stingray | Aer | Deep Freeze | Copper Red | Illicit Research | Artemis | Delayed Action | Quartet | The Star | Proud Amaryllis | Tourbillon | Ominous Blight|
Soul Eater | Mage's Staff | Knight's Shield | Kingdom Key D | Kingdom Key