"Yeah, I've been using them for a while. Anton was teaching me - I helped out with maintenance of the magitech appliances in the Hotel. Incorporating them into hybrid tech is... my specialty, I guess."

Given how long China and Anton had implied it took to master sigils (far longer than a normal human lifespan), Tony's not sure he knows enough for it to count as a 'specialty,' but whatever. He thinks he can do some pretty impressive things with sigils. And, honestly, with how few people in Keeliai know how to use them at all, he might as well call himself an expert.