This alchemy blueprint appears only as a thin layer from a naked eye perspective. But through the eyes of wizards familiar with magic patterns, one can see two layers of different nature magic patterns intertwined.
The two layers of magic patterns are interwoven, sometimes surfacing, sometimes concealing.
One layer of magic patterns is the actual alchemical design; while the other layer of magic patterns is a "lock".
In order to see the true face of this alchemy blueprint, one must unlock this intertwined "lock".
Such "locks" were common on ancient alchemy blueprints, serving as a protective measure by alchemists for their original works.
Nowadays, the alchemy circle in Sky Mechanical City has taken over most of the copyright protection, causing these "locks" to gradually fade away.
Angel has previously only read about such "locks" in books, this is the first time he's seeing one with his own eyes.
