That smoke/blind tadpole ability is fantastic. Being able to sneak mid-combat is great. Also, you can quickly save someone who's about to die by using the cloud, and then using your tadpole ability (I forget what it's called) to teleport to the cloud if you're out of position. It'll cause enemies to funnel toward you or back off and buy you valuable time. And it's easy to abuse the cloud by stepping out, using a ranged action, and then stepping back into it to negate the blind penalty.
