Here's how I will do it:
15 in air magic, 12 in energy storage.
Cast Lightning Surge to begin, the dmg is delayed by 3 seconds. While waiting for Lightning surge, cast Lightning Orb. The delay from lightning surge + the delay from lightning orb lines up perfectly, and the enemy takes roughly 200+ dmg at one moment + Knocked down. Next, cast lightning strike becuase it has no delay, another 50+ dmg there. By this time, the person is standing and right about to cast a heal spell. This is when you cast gale on them. Bam, knockdown again, this time for 3 seconds. This is where you hit them hard with chain lightning, followed up by lighting jav + lightning strike, both hitting for 50+ more dmg, + 100+ more for chain lightning.
In total it brings up more than 450 dmg all while being knocked down. I haven't tested it yet only becuase I dont have lightning surge just yet, gotta go get that soon.
also, if there is a healer around, or if they don't die from all that, I can cast gale on them again for another knockdown and follow up with another lightning orb + lightning strike for a quick 150+ dmg.