The new first act is technically larger than Reaper's Coast, four times larger than Fort Joy. Hidden locations throughout old and new areas. Sail on a boat and explore different isles and the stories & secrets they hold. New areas both in and outside of Fort Joy.
Unique difference is that she'll be recurring as an NPC to interact with similarly to others such as Malady if never used as a player. Fully fledged as starting Origin or recruitable later, with her own major questline. The 'unofficial expansion' adds both new content and changes existing content, aiming to provide a completely fresh and unexpected new playthrough. It's an expansion on the base game, adding a new origin, new important characters and a whole lot of new quests and storylines.
Chronicles of Divinity is a mod for Divinity: Original Sin 2.
