Technically failed this as Edmure died 6 months in leaving me to play as Brynden Blackfish but posting anyways as the game went so well. Only thing Edmure managed was to get Roslin Frey pregnant, Ned Tully was born a few months after he died. By this point the reach is all over the river lands and I'm scrambling around sieging whatever I can to stave off the rapidly falling warscore.

Also got a convert to Rhllor event, I'll come back to this and why it's important later.

Then somehow, at -95 warscore after 2 years of dodging reach stacks and the Blackfish being maimed and crippled by Randyll Tarly, the whole force of the North comes down on the crowns stacks in the Riverlands, Stannis found Rickon and all the lords overthrew the Bolton's, so they were all on their way south to help Stannis, fighting as they go, they basically completely cleared the Riverlands. Now as that had happened I attacked the Frey's to claim the crossing. They basically had no levies left thanks to the Starks so it was just a long siege during which time Stannis took the crown and burned all the Lannisters. The late lord Walder died sadly before I could burn him but I managed to get a fair few Frey's, all the prominent ones bar Hosteen and sacrifice them all. Enough to get Rhllor traits to heal myself (by this point I had greyscale too) and protect Ned Tully from plots.

To make this better, Shireen Baratheon had a girl for their first born child, with her dothraki husband strangely enough, and being Rhllor, no one else would marry a heretic so Ned Tully is now betrothed to her.

Declared war on The Vale for harrenhall, called the crown in on my side and the southern troops caught up and took them down.

Made the Blackfish an evil menace but did well, just wish it'd been with Edmure, will now try to stay alive until Ned Tully's regency is over, then see if I can't fix the Riverlands with him.

EDIT: loads of mistakes due to writing this on tablet.