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Initially the merging of the Dynasty Warriors and Samurai Warriors series, Warriors Orochi is a Hack n' Slash game title that takes the characters of both games and combines them.
The premise of the story is that a powerful demon known as Orochi has escaped from a mystical imprisonment. Using his awesome power, he bends the realms of time and space to pull the greatest warriors history has ever known within so that he may challenge them. The Heroes must now survive in this strange new world, defeat Orochi, and make it back to their own time.
Warriors Orochi is a Koei verse, but several guest characters have appeared in this verse as well, and it thus wouldn't be too hard to believe verses these guest characters stem from would also be a part of the verse.
Examples of canons that would be in this verse:
Dynasty Warriors series
Samurai Warriors series
Dead or Alive series
Bladestorm: Hundred Years War
Warriors: Legends of Troy
Zill O'll series
Soul Calibur series