Tyragon is another name for the world of Shadowgate (also known as Tarkus in the original games)
Dissidia Shadowgate[]
After the 9 surviving warriors finally decimated Chaos, along with Dissidia, Cosmos sent them to that said world, particularly at the woods outside of Stormhaven. That world never had anything they were familiar with, and they reunited with Kain, Tifa, Laguna, Lightning, Vaan, Yuna, Prishe, and Shantotto before their quest thru Castle Shadowgate. The world was under threat as warned by Lakmir of the Warlock Lord's plot on awakening the Behemoth and wreaking havoc across the cosmos like Chaos. As soon as the heroes were successful, with the Behemoth and the Warlock defeated with Shadowgate in shambles, they returned to their separate worlds.