Sets: Law of Julianos,
Queen's Elegance, Ilambris

Gear:
Julianos =
Staff1 (fire/precise/fire damage glyph)
Staff2 (fire/infused/absorb magic glyph)
Chest (light/divine/magicka glyph)
Pants (light/divine/magicka glyph)
Gloves (light/divine/magicka glyph)

Elegance =
Necklace/Rings (arcane/1x increased spell damage glyph/2x magicka regeneration glyph)
Belt (light/divine/magicka glyph)
Shoes (light/divine/magicka glyph)

Ilambris =
Head (heavy/divine/health glyph)
Shoulders (medium/divine/magicka glyph)

If you dont have access to Ilambris you might use Magnus' Gifts Head&Shoulders for the 2 set piece extra magicka.

Food:
Either use blue Magicka+Health or Witchmother's Potent Brew(preferable, has less health and magicka but got a huge mag reg buff).


As I think you're still leveling some of your skills I put in the ones you already should have access to.
After leveling switch:
Frontbar:
- Suppression Field -> Shooting Star
- Force Pulse -> Elemental Weapon(not necessary, esp. if you dont have Summerset or Psijic skills)

Backbar:
- Greater Storm Atro -> Elemental Rage
- Boundless Storm -> Rearming Trap OR Channeled Acceleration


Rotation (the most important):
Liquid Lightning, Light Attack, Elemental Blockade -> Swap Bar ->
Light Attack, Haunting Curse, Light Attack, 5x Force Pulse+Light Attack -> Swap Bar ->
Restart

- Activate Crystal Fragments whenever the instant proc happens. Use The Frag instead of the Force Pulse.
- Use your Buffs (Power Surge, Boundless Storm) before fights and whenever one runs out. Replace one Force Pulse
for it.
- Use Ulti when its ready, preferable Storm Atro/Elemental Rage
- At 20% Boss Health start using Mage's Wrath instead of Force Pulse.