From publisher blurb:
The shade wave rogue is a "minor magecraft" class, which interacts with the magecraft features of the Magus class. These classes are designed to be setting-appropriate to the material the Magus is used for, while allowing players to utilize other classes and not be tied down to a full spellcaster. More will be made available!
A talent for staring into the darkness and seeing potential can arise within lesser mages who are aligned with it. This knowledge of how shadows function conceptually, and this second-hand awareness of the innate power that resides within one's own shadow, can be manifested as skills that reshape the shadow into tools by projecting a change within their perception of the self.
These skills, though born in shadow, are not seen as evil or untoward. Shade wave magecraft is a form of self-perception magecraft that treats the shadow as a temperable reflection of the self, and a tool that can be utilized in many situations.