Head and Shoulders - Molag Kena
5 pc - Julianos or 5 pc Infallible Mage
5 pc - Elegance
Maelstrom Lightning Staff
Maelstrom Restoration Staff

Heavy Staff Attack Bonuses
Elegance - 20%
Champion Points - 25%
Molten Armaments - 40%
Wall of Elements (with Maelstrom staff) - Set Amount

Lightning and Magic Damage Bonus
Altmer Passives - 4%
Molten Armaments - 20%
Champion Points - 9.5%

Misc. Damage Bonus
Elemental Drain - Reduces spell resistance significantly

Before the fight, activate molten armaments and mutagen. Open it up with elemental susceptibility then hit them with elemental blockade and fossilize. After you're sure they've been hit with both charge up your heavy attack, and let loose. The Lightning staff allows you to focus on the one person you hit with elemental susceptibility and not have to worry about enemy dk's, and the splash damage will be 20% stronger to those around the individual.

When you're on the defensive, break line of sight as much as you can after hitting elusive mist to make distance. First hit dampen magicka, the stronger ward, then healing ward to heal yourself. This way your healing ward is hit last and you get the full heal. Elusive mist ends before healing ward does, so it'll heal you almost directly after mist ends. If your mutagen is down, put it back up. If they use projectiles, use dragon fire scale as soon as you see them activate a skill, not too much before, so they don't wise up. The stun should let your healing ward go through, as well.

Note - Use Destructive Reach rather than Wall of Elements until you obtain Maelstrom Inferno Staff