Divinity: Original Sin is a game that gives you a lot of freedom and plenty of gameplay mechanics to use or abuse. The game's epic story may drive you toward your ultimate end-goal, but how you get there is entirely up to you.
Or up to you and a friend, because Divinity: Original Sin can be played completely cooperatively, and features both online and local drop-in/drop-out multiplayer. Great adventures become even greater when shared with a trusted comrade-in-arms!