The combat log.
There's a log that keeps track of every action in combat. You can see how much damage (and whether it's a critical hit) that you, your summons, your abomination and the monsters dish out. SUPER useful when you're trying to figure out if this weapon or armor is better than that one. Is this spell working like I think it does? Is this summoned demon worth the mana he cost?

Since one of the developers is roaming the forum I'm posting this to remind him how handy this feature is - it should be in future Divinity games.

Maybe with toggle switches so you can choose how much detail you want to see.

It does come in handy.