Before finally releasing some stuff from season 7 I thought I should upload this first...
This has probably been the hardest shot I ever worked on in all GOT seasons. I started with layout, lighting, mattepainting and projections on this shot and put everything together in compositing in the end. We had no time to sim fumeFX for this shot so I placed around 400 cards with smoke footage in Nuke.
check out full breakdown here