Shadow on the Moon

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards' ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models game as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

EndlessFantasy Translation 

A Wizard's Secret

J_Squared

Before this, the old Spell Caster appeared to be on his last legs in the Flame Prison, but now a tremendous force shimmered around his body. In particular, the layer of flames covering him flared up violently, faintly repelling the flames of the Flame Prison.

This tremendous presence immediately froze Merlin where he stood. Nonetheless, Merlin did not bat an eyelid. On the Ship of Nikola, he was unafraid of anyone. Furthermore, they were in the Flame Prison. Not just anyone would be able to withstand the endless flames. The old Spell Caster was no more than someone who appeared stronger than he really was by forcibly radiating his presence.

Seeing that Merlin remained cool and collected with an unperturbed expression, the old Spell Caster, who seemed to have such vigorous force a moment ago, immediately turned dispirited. The surrounding flames wildly wrapped around him and a pained expression appeared on his face.

A Slave Contract!