Dark Souls 2 seamless co-op mod is "close" to being playtest-ready, having morphed into one of its creator's "most complicated and ambitious projects to date"

https://www.rockpapershotgun.com/dark-souls-2-seamless-co-op-mod-is-close-to-being-playtest-ready-having-morphed-into-one-of-its-creators-most-complicated-and-ambitious-projects-to-date