Berserk Game:
If we are talking about "dreams" I'll just go and say it should a hack and slash made by a colaboration of Sony Santa Monica and Platinum. Platinum can handle the gameplay and SSM can handle the technical side.
And it should tell most of the story. Mabye the "massive war" level can handle something like kingdom under fire II but then you get smaller levels that play more like a traditional hack and slash (less button mashing and more combos)
Avatar: The last Airbender
Make it a semi-open world action RPG set in the world of avatar. It would need to get the original creators and writers on board to create a new original story with a new cast of characters. Make it canon, sort of like the official new saga after Korra (not some BS "paralel story like most LOTR games).
You play as the avatar but there is a whole character creator and you can choose your nation to set your "core" element. So if, for example, you choose fire nation then fire will be your main skill tree and you will only get a few skills from the other elements.
Have sucker punch develop it (mabye in a colaboration with some other developer). With Infamous (second son in particular) they showed they can make elemental combat be fun and look amazing.