Stepped away from the game since I thought it's a matter of waiting for an updated public version, so apologies for not responding to RedFlash (dev) for about a month.
Also, I believe making a new comment would be better to aid those of us who are blind as hell 😅
Ok, for those who made a new game, after acquiring Aeren, Fenris then says to build a Reception Room, with no visual indicator of where to perform this action.
You need to find the Construction Room, which is on the right side of the castle, opposite end from Kostyx's shop.
Hope this helps everyone who wants to enjoy this game.