It lets you overlap 4 aoes, I cast them in order of:
-Burning Ground > Hailstorm > Lightning Storm > Lightning Field to mop up.
The Charged field talent makes the lightning field splash for a large amount of dmg.
-Every other pull or if the fight goes on long enough you can do this rotation:
Burning Ground > Eye of the Storm > Hailstorm > Lightning Storm > Lightning Field X 3
Same principle except eye of the storm requires charge to use.
-Other things to conisder, sometimes ill start off both rotations with a:
Artic Blast > Flash Freeze > Absolute Zero + Artic Blast > Regular rotation
2ndary Damage rotations:
-Forked Lightning X 3 > Artict Blast/Absolute Zero + Artic Blast > Lightning Field X 3
-Forked Lightning X 3 > Artic Blast > Lightning Field X 2 > Forked Lightning X 2 > Artic Blast > Lightning Field X 3
-Also you can throw in Static Discharge for bonus damage.
-Getting 5/5 Tempest in Elemental Summoner is Key for the build, max it as soon as humanly possible after getting Lightning Storm. I only suggest this build again at lvl 31+.
-Dominator and Archon interchangeable depending on needs for self buff or CC