Forging a real Mana weapon
Jason looked at Dalia in visible confusion after reading the title of the file he'd received, not knowing why his masters had shared such a rare technique with him.
If his knowledge was not completely wrong or forged, only the highest authorities within the army, big families, their offsprings, and other individuals should have the ability to obtain a concealment technique.
Humans at the magus and the ranks above them were able to conceal their mana fluctuations to a certain degree, however, the disguise was shallow and others would still be able to perceive the rank roughly if one wanted to know it.
But the concealment technique was somewhat different. As long as someone a few ranks higher than him wouldn't try to figure out his exact mana core rank, Jason would be able to conceal it, with a few particular exceptions like he himself was, which could have positive and negative results.