Firewall is a COMPLETE waste of points.

Best bet, is orb + synergy + cold master + lit + synergy + lit mast, not sure its going to work, but it's worth a try.

Lit because it does more damage, less mana, and with a bot it will hit EVERY time, so I'd say it's better than chain lit.

If you have a rigged sorc, go with Chain Lit (it eats mana fast as shit)