Does anyone have any stories of having used Cloudkill in their games? As a 7th level spell, it ought to be pretty powerful, but it’s got a lot of obvious drawbacks. Like that, as written, you have to have something else around also doing damage to get any effect out of it at all. And that 1d6/target is less than the 2d6 done by the 3rd-level Fireball spell. And that it seems pretty hard to use without affecting your own party as bad or worse as the bad guys. And that it costs 7 points to memorize, so if you take it you have to give up, for instance, Dispel Magic and Sleep and Charm Person.
Is it really worth it? Convince me.