I was pleasantly surprised with Cloud Kill when I returned to Maya and respected into it. It’s so good now.
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Cloud Kill also works great on Rakk. Since they tend to fly on the same path, one shot at the leading Rakk creates a cloud that the trailing Rakk fly into and die. That is truly a Cloud Kill. Using it on the ground should be called a Fog Kill 
Tried something new with cloud kill last night. Respec’d to Cloudkill + Converge. Group them together, then dissolve them. With points in Helios, you PL something, shot them with Slag, and everyone gets burned, corroded, and slagged. Things go bye bye. Next thing I need to find in a slag Bouncing Betty, or similar. Also a corrosive relic.