Erenshor is an upcoming MMO inspired by the classics of the late '90s and early 2000s - specifically Runescape if you're judging by the art style - but there's a massive differentiator: it's single-player and thus isn't actually an MMO at all. In place of real human players, Erenshor instead has "persistent simulated players" that will "get to know you," invite you to raids, and journey right alongside you just like the real thing.
Of course, the term "single-player MMORPG" is an oxymoron, but developer Burgee Media skirts around this technicality by saying the "the 'O' stands for 'Offline'." As for the 'multiplayer' component of that acronym, well, there are other players, but none of them are controlled by humans.
