I attempted taming a greater dragon for you yesterday, but I had a run of bad luck and ultimately ran out of time (I only spare about half an hour for gaming these days). I'll give it a shot again today if you're still in need.
*edit*
Got you one. I don't know how brilliant it is but it has more hp than mine so it should tank well against ancient wyrms. Balrons and anything below that are crunchy croutons for a greater dragon so the rest of the T-map spawn shouldn't be an issue. PM me for a pickup.