Two bugs related to the scenario-ending Forge of the Overlord quest.
(1)The quest is available through quest maps. It appeared for me in the southwest corner of the map while doing some quest map spamming with a secondary hero.(It appeared after about 5 quest maps)
(2)The quest can be done without the sovereign's presence and one can fight the final battle with another hero. The scenario texts make no sense in this case though, because they still reference Relias.