A "Story" difficulty level was added for players who want to focus on the lore and exploration rather than the deep tactical combat.
Enhancements were made to the Arena (PVP) mode and the Game Master Mode , which allows players to create their own tabletop-style campaigns. Divinity.Original.Sin.2.Definitive.Edition.part...
Based on the title structure "Divinity.Original.Sin.2.Definitive.Edition.part...", you appear to be looking for a feature or summary covering the core enhancements found in the of this acclaimed RPG. A "Story" difficulty level was added for players