I Was Reincarnated as the 7th Prince so I Can Take My Time Perfecting My Magical Ability volume 4

Has the unstoppable boy who made sorcery his whole life finally met his match?

Prince Lloyd and the assassins have finally found Jade, the old leader of the Assassins Guild. But they find his body has been taken over by a powerful "demon lord," the one they call Guisarme. His strength is magnitudes beyond any foe Lloyd has faced before, is invulnerable to sorcery of all kinds, and wields the power of teleportation. Will Lloyd still be able to magic his way through this situation?