Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Beta OP Arrow Spray kills basicaly everything,

It's much more powerful than Barrage, so you could argue it's a Way of the Ranger level 5 skill (the AP cost should be a couple more than a normal bow shot as well).
It's something you should be working hard to get to - the culmination of your development as a Ranger, rather than the first skill you receive.