Just finished doing the master quest in 0.913 (with cheats - they actually proved necessary at one point), and I encountered some bugs.

First off, since the Dragonlord attacks as soon as you get to the original dragon statue with the two eyes, and beating him wins you the game, that renders the whole mountained-off section with a gate and him inside irrelevant.  I get the impression that returning to the dragon statue is supposed to open this area (and not make Waerga attack), so you'll need to modify the event accordingly in code.

Also, when doing the quest for one of the eyes where you go to the two caves to beat the guardians, one of the caves appeared inside the mountained-off area with Waerga, so I had to use the teleport cheat to get in there.  So I guess you'll need to adjust the spawning algorithm for these quest areas so they don't appear in any of the teal-bordered regions.

Hope that helped.