Pick up Recharging Aspect from the Zenith dungeon in Fractured Peaks. Use Frost Bolt with Glinting Frost Bolt as your Basic with Frost Nova with Mystical Frost Nova to increase mana regen and decrease the number of casts needed to clear a pack. Add the Fireball Enhancement for more group damage.

Mystical Frost Nova gives Vulnerable and Freezes over a larger area than Flame Shield's burn aura, which lets you generate mana from Frost Bolt more easily than Fire Bolt.

Open with Frost Nova then cast Frost Bolt, then Chain Lightning and alternate between casts of FB and CL to regen a bit of mana between CL casts.

Level on World Tier 1 the first time, the XP and gold bonuses don't equal the increased monster health so you'll level more slowly even though you get more XP

Buy 1 level of Fireball and 1 level of Fire Bolt for the Enchantment abilities

WT4 Arc Lash Sorc, I make things explode so much and I don't have to worry about staying at range because my Basic is melee anyway. The amount of cc is high so I stack damage against cced targets and go for execute change to trigger the Fireball passive and watch packs of mobs just erupt into a series of explosions. It's so satisfying. I was going Pyro because I liked the big snake Ultimate visual, but I got over it when I saw the damage I was putting out.

Also get the Aspect of Efficiency from Domhainne Tunnels in Scosglen

Arc lash ftw

Just respecced to Arc Lash from all Pyro, big dmg output increase