Glacial Spike

Cast out a shard of ice that explodes on impact, causing enemies within 4.5 yards to take 175% weapon damage as Cold and be Frozen for 1 second.

Enemies cannot be Frozen by Glacial Spike more than once every 5 seconds.

Unlocked at level 13

Obliteration

Increase the speed of the orb and its damage to 700% weapon damage as Arcane, but reduce the area of effect to 8 yards.

Unlocked at level 11

Storm Chaser

Each cast of Energy Twister grants you a Lightning Charge. You can store up to 3 Lightning Charges at a time. Casting a Signature spell releases all Lightning Charges as a bolt of Lightning that deals 196% weapon damage as Lightning per Lightning Charge.

Energy Twister's damage turns into Lightning.

The following skills are Signature spells:

Magic Missile

Shock Pulse

Spectral Blade

Electrocute

Unlocked at level 52

Time Shell

Increase the potency of the movement speed reduction to 80% and reduces the cooldown to 12 seconds.

Unlocked at level 23

Force Weapon

Increase the damage bonus of Magic Weapon to 20% damage.

Unlocked at level 35

Prismatic Armor

Energy Armor also increases your resistance to all damage types 25%.

Unlocked at level 60