Experience a richer, more distinct, and dangerous world with the first Erannorth Chronicles expansion. "Ancient Ruins" will expand the world seamlessly with new Challenges, deadly bosses, and new loot suitable for mid to high-level characters.
DLCs for Erannorth progressively increase the game's complexity and difficulty and aren't recommended to own before you are familiar with the base game. If you try to decide which to get between the available DLCs, I would advise getting them in release order for a smoother transition in Difficulty and Complexity.