I noticed while completing Threnall ruins south which basically completed the story arc there were many loose ends that never got tied up.
Such as who is the character that looks like Coyle but is not. Who murdered the first party in threnall West? We are TOLD of what happened, but what really happened?
My idea is to make a sequel to Threnall Ruins.
Just put it in the same place as threnall with new quests and a final raid. Similar to how LOTD went.
I mean Stormreaver is technically a sequel to Tempest SPine and Shan-to-Kor is a sequel to Waterworks. Why not one for Thren?
Yu could go further and even continue with other quests like CO6 or VON or even some of the other "chain" quests like delara.
I mean its great to go back and see these quests again but made for the higher level characters.
Thats how you can make VON still viable to like say a level 20.
There should also be more decision matrixes in quests such as an evil line and a good line.