So on my quest to looking to kill Siegemaster Lormar I found that one of the pre-events is stuck. Standing on the Viewing Hill in Plains of Ashford the event “Protect the siege team as they approach the wall” is shown as active. Only there is no siege team on the way, going to Swordcross Outpost where it supposedly starts shows another NPC with an event start marker on her head, Aymber Blastrock. But talking to her will not allow to actually start that event either, as she only offers one of supposedly two possible dialogue options, missing the one to start.
Since the outcome of this whole event chain is needed for anyone wanting to build Nevermore, please go fix it