[@Lmpkio] - As far as physical stuff goes that's fine. According to his realm info the cities themselves got some potent light magic and unless it's Dirka's magic he's the one supplying the power ultimately. Such is the same with all light magic his followers use.

Edit:[@Lord Zee] - Well with each god having realms that include structures unique to themselves exceptions can occur. I will admit though that having his followers build these structures without aid from the god of knowledge or otherwise does strike a bit odd. It'd make more sense if it was his creation as opposed to his followers.