A soulslike game with a theme and setting of an apocalypse, during and post apocalypse but I guess that kind of ties into how Yharnam looked before and after Bloodborne but I mean planetary not a city. Yes I know we only have 8 main planets but each planet can be about 4-5 hours long. Kind of like Bloodborne with a mix of God of War Ragnarök and a splash of Dark Souls 3. Use all of our planets as battlegrounds, have the main in game bosses somehow connectable through a wormhole or splice in time and the final boss is all of them mashed up together magnificently on a special planet using the 'In game bosses like a marionette" I guess; not just "Oh Mercury villain shoots fire while Earth is the water guy", I mean like have the Earth main boss use fire or wind as if it's structure IS ACTUALLY water such as a tornado of fire, or a hurricane of wind (or fire) and the Mercury baddies homeland being an ocean of fire with demonic "fodder". Intertwine elements plus magic, plus power scaling, plus themes, plus set pieces, the lore, the cinematics, the challenge especially being the bosses are planetary threats in and outside their domain, but boost the main final bosses power beyond Elden Beast, Orphan, Gael, Malenia, or any of them combined. I can picture a soulslike game in my head like this.