Skills

The skill distribution with this build concentrates on maximizing the harm output of Firewall and Frozen Orb, in addition to synergies and utility skills. Something to notice here is that given Firewall's insufficient effective synergies (warmth being decent, and inferno as being a weak synergizer (+1% damage), it's unnecessary to get more than around 60 points in Firewall, Synergies and Fire Mastery. Frozen orb is comparable, with just one synergy and mastery which makes it a great secondary damage and cc spell. Buying D2R Ladder Runes can help boost your gear in D2R Ladder, which benefits physical damage dealers and specs that benefit from scaling.

Fire Spells:

Fire Bolt (1 point): Pre-requisite

Fireball (1 point): Pre-requisite

Firewall (20 points): Primary fire damage spell.

Warmth (10+ points): Mana regeneration skill along with a new synergy to Firewall in D2R (+4%)

Inferno (1 point): weak synergy to Firewall (+1%) 

Cold Spells:

Ice Bolt (1+ point): Pre-requisite and synergy

Ice Blast (1 point): Pre-requisite

Frost Nova (1 point): Pre-requisite

Glacial Spike (1 point): Pre-requisite

Blizzard (1 point): Pre-requisite

Frozen Orb (20 points): Primary cold damage spell.

Cold Mastery (10+ points): Increases cold damage by lowering enemy resistances. This caps out at -150 resistances, so don’t skill the power past this.

Lightning Spells:

Static Field (1 point): A must-have for those sorceresses, reducing enemy health with a percentage.

Telekinesis (1 point): Pre-requisite for Teleport.

Teleport (1 point): A vital mobility skill.

The remaining skill points can be put into Fire Mastery to help boost Firewall's damage or Ice Bolt for further Frozen Orb damage.

Stat Allocation

Strength: Enough to equip gear (typically around 110 to 120).

Dexterity: Enough for an optimum block if utilizing a shield like Stormshield, otherwise leave robust.

Vitality: All remaining points.

Energy: Base, as the gear usually supplies sufficient mana.

cheap d2 resurrected items and more at MMOWTS