I just had a probably dumb idea: instead of dragons, the Targaryens had the Founding Titan. Lannister-Warhammer Tyrell-Armor Martell-Jaw Baratheon-Colossal Stark-Beast Targaryen-Founding, Attack Arryn-Cart Tully-Female Greyjoy-N/A In this, the Pact Renouncing War was created by Aegon the Broken, and was negated when the Targaryens lost the Iron Throne. Daenerys unlocks its full power. Also, this would have Joffrey stealing the Beast Titan from Eddard. Any other ideas to build on this?
Question. Why does this even work in the first place? You're just chucking an entire new powerset in this setting. Why do you think this would be even be well, normal?
Well you if you changed up some things and made it your own, this could be a good start to world-building for maybe your own series. You can borrow ideas and change them into things you want, then generate histories and timelines that make sense in the story you want to write. I think you could advance thisbeyond simple crossover in to something more of your own.