Originally Posted by
You
SBR would be a great idea for a grail war, but I don't think that Heroic Spirits would fit very well with the themes and the premise of Steel Ball Run.
Thinking about it now, I'd want to make something like this if I was doing a SBR-based Grail War.
Slightly fusing the the Extraverse and Miyuverse, in 1870 a certain ritual was completed and mana has been deteriorating. At the same time small amounts of an unknown compound (Grain) has been showing up in the world.
Go to 1890, the dying organizer without an heir announces that a ritual is in progress to create a Holy Grail out of the land he owns, a stockpile of magical energy that will be given to the winner. In that sense, it is at literal "Holy Grail" for magi as it will ensure prosperity for that family for the foreseeable future where every other family is screwed.
Using the entirety of (insert some country here) as the ritual ground, participants have to reach certain super-key fallen leyline and permenantly dye it with their magical energy. The optimal route to each super special fallen leyline being the route of the SBR event. The magi who dyes the most points will gain the most magical energy therefore the Holy Grail.
However, the true purpose of the race (like SBR) is to collect the body parts of a certain white princess cough who "died" in (insert country here).
The organizer seeks to collect the princess's body parts and use them to create another earth or something inno I came up with this while eating a burrito. Or something to stop of the Grain. Or whatever, it depends on the theme of the story.
However when the racers accidentally come close to a body part they're sent to what seems like a different dimension (Marble Phantasm) like how the land warps around the Saint corpse in SBR. Also magi notice that they gain powers when they touch the body parts (Rudimentary Knight Arms because each body part basically a dying planet hemorrhaging Grain) like how the SBR people get Stands when touching Jesus.
There would probably some Dead Apostles in this as well then, like Merem.
Like I said I came up with this while eating a burrito and reading what Imperial posted. But sounds like it would be interesting.