Sekiro game files seem to reference the FromSoftware game George R. R. Martin is apparently working on
Let the hunt begin.

Rumor has it that A Song of Ice and Fire author George R. R. Martin has worked on an FromSoftware and Dark Souls creator Hidetaka Miyazaki, and now some Reddit s believe they’ve found clues about it hidden in the game files for Sekiro: Shadows Die Twice.
As GamesRadar+ reports, modder TKGP spotted a curious path in Sekiro’s material configuration files. The path points to a folder titled “GR,” which TKGP reckons is short for “Great Rune,” the codename for FromSoftware’s title.
Apparently there was a sneaky little reference to Great Rune sitting here in the Sekiro material configs all along. pic.twitter.com/H5uKZOUzZiMay 29, 2019
That’s different from the standard folder for Sekiro assets, which are stored in a folder called “NTC.” Modders aren’t sure what exactly that stands for, only that it’s the abbreviation FromSoft uses for Sekiro.
Reddit Kalash believes this is a strong indication that Great Rune is currently in active development, and that it’s being built in FromSoft’s internally-developed game engine rather than in Unreal Engine 4, as some rumors had previously suggested. That's based on the reference to a map called "m99," which is debug level From uses for its engine.
Granted, an asset folder with a two-letter name isn’t a lot to go on, but it bears ing that FromSoftware delights in hiding little hints and secrets around its games: there’s a character in Bloodborne who looks an awful lot like the Wolf from Sekiro, for example.
Hopefully we’ll learn more about Great Rune—or whatever it’s going to be called—at E3 in a couple weeks.
The biggest gaming news, reviews and hardware deals
Keep up to date with the most important stories and the best deals, as picked by the PC Gamer team.