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

Black Ice

Enemies killed by Ray of Frost leave behind a patch of ice that deals 1625% weapon damage as Cold to enemies moving through it over 3 seconds.

Unlocked at level 28

Comet

Summon a Comet that deals 740% weapon damage as Cold and freezes chilled enemies for 1 second upon impact.

The impact site is covered in an icy mist that deals 235% weapon damage as Cold over 3 seconds.

Unlocked at level 43

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

Frozen Storm

A whirling storm of ice builds around you, dealing 80% weapon damage as Cold every second.

Unlocked at level 53

Mammoth Hydra

Summon a Mammoth Hydra that breathes a river of flame at nearby enemies, dealing 330% weapon damage per second as Fire to enemies caught on the burning ground.

Unlocked at level 56