[suresir]

It has a MR save, which means a lot of units will escape. If it hits, it still does only 1 armor negating damage. That gives you a 1 + 2d6 damage roll versus a 0 + 2d6 protection roll. So you'll need a good damage roll to seriously hurt the enemy. Once you're surrounded by enemy troops, some are bound to get hit every turn, and soul vortex really shines there.