What ability would you like to see added for your Job in the Expansion? (theorizing)

[point09micron]

For BLM:
An AOE ground targeted spell "Storm" or similar.
Cast time: 3.5 or 4.0 seconds. Duration: 30 seconds. Range: 25 yalms. Effect: 5 yalm radius. MP: maybe 50% more than Thunder 3.
Effect: On each tick count, has a 10% chance to apply "Thunder 0" (12 second duration DOT) to an enemy inside the AOE. Each potential target is an individual roll, so some ticks might have 0 hits, some might have more than 1, and the same enemy might be targeted twice. A visual effect of a dark cloud over the AOE, and lightning striking down from the cloud to the targets would be awesome. I'd say "with rain falling" also, but that's a Conjurer thing.

The way I see it, a straight AOE Thunder would be too overpowered due to Thundercloud. Applying some chance to it makes it more balanced, in particular that the same enemy may be targeted more than once, which wouldn't really increase the chance of Thundercloud procs at all.