I admit I am a bit rusty at the overall power scheme of the attack myself, but the reason it is a good option could lie in it's ability to block off a square and use it strategically. For instance, a creature in combat would tend to avoid a cloud of magical blades if a safe square remains somewhere else. The exception would be if the creature is too dumb or too smart. For instance, a kobold/bugbear/goblin would go around unless they really needed to get through, but a zombie would just bust through, and a smart tactical enemy might suffer the extra dmg to get in a better position.
Why it is also cool though is it is something that enemies can be pushed through to add bits of dmg onto a forced move effect. If he pushes his wisdom over the long run, it makes powers like that and thunderwave much more potent, and even supplemental to each other to control the battle.
I like ray of frost too for all those escaping enemies, but since we need more crowd control, these are good choices.
Why it is also cool though is it is something that enemies can be pushed through to add bits of dmg onto a forced move effect. If he pushes his wisdom over the long run, it makes powers like that and thunderwave much more potent, and even supplemental to each other to control the battle.
I like ray of frost too for all those escaping enemies, but since we need more crowd control, these are good choices.