I've burned Trancquillius, but, when I came back to Glatzburg, Welhar has no new dialogue lines and I don't know what to do. It seems that after burning Trancquillius, ACT III should have started...

Edit: It seems I just needed to go to the main map... In the game, none mentioned Alvaron, how could I know there was a new reachable city on the map? I also reloaded an old savegame, explored and cleaned all those stupid dungeons again and burned Truncquillius a second time, since I though it was a bug... What an obscure game!

Anyway, this topic should be removed, I was not able to.