Booggie
for the knowledge that the system can offer I have some ideas if it can help: I don't know if it's a legendary or divine level but reality magic like that of wanda maximoff? in rare or epic, there would be technomency which makes it possible to control/manipulate technology thanks to magic. in view of how the mc and already overpowered I can see this knowledge only in rare, the magic system of the world of skyrim / elder Scroll illusion / destruction / alteration / healing / conjuration. epic/unique, unlock his aura from the rwby universe which in addition to providing him with a semi-permanent shield, allows him to have a semblance. and he can unlock it at his subordinate without his being enough to betray him.