Is there anything of interest in Riva we should know about?

Is there anything of interest in Riva we should know about?

It’s not exactly in Riva, but in the swamps outside there’s a tower, where a magician has set up shop. Not that I’ve anything against magicians - I’ve been friends with one for years - but the guy in that tower gives me the creeps: he’s butchering innocent pets for some weird experiments of his.