Dishonored, Bethesda’s excellent steam punk-meets-occult stealth series, is getting a new expansion on September 15th, the developer announced this evening at its E3 press conference. As many fans suspected, the expansion puts players in the shoes of Dreadful Whale Captain Meagan Foster, who in a previous life was an assassin who went by the name Billy Lurk. But in a satisfying twist, Bethesda has you hunting the Outsider, the mysterious and seemingly immortal entity who imbues select citizens of Dunwall with magic powers.

This expansion, called “Death of the Outsider,” is billed as the Dishonored universe’s first “standalone story,” meaning it’s not technically tied to the second game, though it appears to take place after the sequel’s end. Unlike the original game’s “The Knife of Dunwall” and “The Brigmore Witches” DLC packs, this one could be the beginning of a long string of episodic one-off experiences that further build out the series’ world, something that seems increasingly likely given the Dishonored 2’s poor sales performance. We don’t yet have pricing details, but as it is something larger, akin to Infamous: First Light, it may in the $30 to $40 range.

The trailer has Meagan, how with a cyborg eye and Corvo-like powers, freeing the assassin Daud in the first step toward the ultimate goal of eliminating the Outsider. So regardless of how much it costs, or how long it ends up being, “Death of the Outsider still looks like it could be the most intriguing and worthwhile Dishonored expansion yet.