It is pure turn based. From the blog post Divinity � Original Sin revealed !

Originally Posted by Swen Vincke
Active-pause was considered for some time (and we actually started out like this), but in my heart I really wanted to make one of those games that has epic tactical battles, where you really have to think how you�re going to defeat the enemy. And because I�m occasionally very impulsive, one morning I stormed into the office and told the team that we were going to ditch all the hack & slash stuff and go for turn-based. I was ready to go all despot on them should I encounter any resistance, but to my surprise, they were actually quite supportive of that idea. Then I discovered they were a little bit too supportive, because before I knew it I had an ultra-hardcore system on my plate. Eventually we settled on something that I think is quite accessible, but still offers plenty of opportunity for tactical depth.


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