Enhancements were made to the Arena (PVP) mode and the Game Master Mode , which allows players to create their own tabletop-style campaigns.
The inventory system was updated to allow for party-wide management, and the quest journal was redesigned to be more intuitive for tracking multiple storylines. 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. Enhancements were made to the Arena (PVP) mode