The first details for Final Fantasy XV’s paid DLC have been revealed, and it comes with plenty of new content.

In a making of book handed out to fans, a section near the end talks about the development of the game’s first paid DLC, Episode Gladio. Producer Haruyoshi Sawatari described the expansion, saying:

The player confronts an enemy called Gilgamesh, who can only be seen in Episode Gladio. In Episode Gladio, you’re able to go into areas that cannot be entered in the main game.

While Episode Gladio and the other DLC currently have no release date, Sawatari says this and the rest of the game’s DLC will “blow your mind.”

Episode Gladio is the first paid DLC for Final Fantasy XV, and will be released after the previously announced Holiday Pack.