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

Merlin was just about to tell Wizard Leo about his possession of Pandora Demon Ability but Wizard Leo waved his hand lightly. "Whatever Pandora Demon Ability you have, that's your secret. You don't have to tell me.

"I'm just feeling gratified. What is Kleis in comparison? You're far more outstanding than Kleis. Weiss and Bluebird are only the beginning. In the future, you must kill Kleis with your own hands, understand?"

A beam of light abruptly shone out of the crimson third eye on Wizard Leo's forehead, and he wore a grave expression.

Merlin was somewhat taken aback. According to the pact between the Dark Magic Region and Ozmu, Spell Casters above Fourth-level were not allowed to make any moves. However, Merlin was not a Spell Caster above Fourth-level, but a First-level Spell Caster. Even if he leveled up in a short time, he would still merely be a Second-level Spell Caster.

Clue II