[@kingkonrad] I'll be on later tonight, we'll figure this out.

[@Abefroeman] It would have been fairly brutal but we're going to assume that all of the notable families pulled through one way or another, just to keep options open. Of course there would have been many casualties but that goes without saying. Since the backstory is a melding of book and show canon, I had Daenerys and Aegon strike a pact when she arrived in Westeros; so the Reach, Dorne, and a part of the Stepstones backed them while the Vale, the North, and most of the Riverlands backed Jon. The West and the Iron Islands would have been in an alliance between Euron and Cersei, and the Stormlands would have been a bit of a clusterfuck and torn in multiple different directions. Later Euron and Cersei are both taken out of the game, Aegon is revealed to be a Blackfyre (but is then accepted into the Targ family), and the kingdoms are united under Jon and Dany to fight the White Walkers. 

As for blood feuds, that'll be up to the players but I think we can assume the Lannisters aren't particularly liked by any of the other Houses, along with the Freys and Boltons. The Tyrells and Florents are probably somewhat cold too. I don't think Jon and Dany would have been terribly merciless, so only the clear wrongdoers were punished with exile to the Night's Watch or execution, but most people would have kept their titles and lands. For the Band of Seven, most of them might be able to regain former lands or new lands might be carved out of existing ones; we'll just have to see. I don't have an exhaustive list of ruins or anything like that, but new holdings can be built or rebuilt. 

[@Masterkeun] The grand melee is more of a giant free-for-all with hundreds of mounted competitors at the same time. What Steffon has been doing is more along the lines of one-on-one duels. In the melee, people can make alliances as they please but there can only be one winner. Steffon is free to join and then get knocked out by someone if that's what you wish.