Easy build for Story PvE
I went Scepter/Dagger or Dagger/Dagger depending on what better weaps i found. Prefered Scepter tho.
For utilities i went Arcane blast, Arcane wave, Mist Form and my elite Glyph of Elementals.
Traits were 20 in Air(Quick Glyphs and Air training) , 20 in Water(Cleasing Wave and Vital Striking) and 30 in Arcane (Elemental Attunement, Arcane Mastery and Elemental Surge).
As for armor specs i went Full Power, Precision and Crit damage.
I Had no problems what so ever lvling in this build( Make sure you stancedance to get the boons from every attunement + get all the utilities from Every attunement! If you stay into 1 single attunement, you’re doing it wrong).
Hope this helps you.