The performance of the instrument satisfied Lydwen III. He knew that Leon would not deceive him with meaningless magical effects. Its efficacy was crucial to whether the Orland Royal Family's magical institution could be established and maintained. If it were a fake, it would only deceive for a moment, not a lifetime.
Moreover, whether the item is useful and whether competitors pose a threat, the subsequent reactions of the Northern Wizards can also be verified. This is the charm of balance.
Letting the Royal Palace Attendant take away the testing instrument, Leon did not feel distressed. This thing was originally made with alchemy materials and funds provided by the Royal Family. This visit was also a tribute to Lydwen, serving as a report on the initial results of a project for the Royal Family. When the next batch of materials arrives, Avalon can produce more.