I "released"
Castle Wyvern almost a year ago. It has a knight riding a wyvern, and a stealthy wyvern-riding commander with patrol bonus. The graphics are okay, but it sucks because I only made one site, and attached it to MA Agartha to see if the creatures worked. I'd have made it an independent site if that was moddable.
Any way, in case someone's interested, attached is a text file that goes into detail about what I'd do with it if I'd just be bothered to do the graphics.