Enryu's Thorn

Enryu's Thorn, also referred as "The Real Thorn" or "The King Slayer Thorn"  is a massive object found at the location where Enryu killed the Forty-Third Floor Guardian. It was somehow acquired by FUG, who found that it was "dead" and could not be used. The organization subsequently worked with the Workshop to try and find ways to create living Ignition Weapons so that the thorn could be implanted in a being and used to fulfill their objectives. FUG's intention was to give the Thorn to the Slayer Candidate Jyu Viole Grace to increase his power and aid him in killing Zahard. However a faction within FUG lead by Karaka decided that this was too risky, and planned to merge Viole into the thorn, activating it in a manner that would allow it to be used by anyone strong enough to wield it.

The Thorn was hidden within an aquatic arena being used for the Workshop Battle. In a turn of recent events the Thorn has been stolen by Jyu Viole Grace. According to Hwa Ryun, the "fake thorn" given to Viole acted like a "bowl" for the real Thorn, allowing Viole to take the real Thorn within himself. It now hovers above Viole's right shoulder in a compressed form, similar to Horyang's wing.

Though it is called "Enryu's Thorn", it's still unknown why F.U.G. assumed it belongs to Enryu and that is what he used to kill the Guardian at 43rd floor. However, it is still unknown what it is and what it will become once activated.