This is a Signature spell. Signature spells are free to cast.

Summon a spectral blade that strikes all enemies up to 15 yards in front of you for 168% weapon damage as Arcane.

Primary

Unlocked at level 11

Cost: 20 Arcane Power

Cooldown: 12 seconds

Conjure a Black Hole at the target location that draws enemies to it and deals 700% weapon damage as Arcane over 2 seconds to all enemies within 15 yards.

Mastery

Unlocked at level 61

Cooldown: 120 seconds

Transform into a being of pure arcane energy for 20 seconds. While in Archon form, your normal abilities are replaced by powerful Archon abilities, your damage is increased by 30%, and your Armor and resistances are increased by 150%.

Each enemy killed while in Archon form increases your damage by 6% for the remaining duration of Archon.

Mastery

Unlocked at level 30

Cost: 25 Arcane Power

Imbue your weapon with magical energy, granting it 10% increased damage. Lasts 10 minutes.

Requires Weapon

Conjuration

Unlocked at level 20

Cooldown: 11 seconds

Blast nearby enemies with an explosion of ice and freeze them for 2 seconds.

Defensive

Unlocked at level 4

Cost: 25 Arcane Power

Surround yourself in a barrier of ice that reduces damage from melee attacks by 12%. Melee attackers are either Chilled or Frozen for 3 seconds. Lasts 10 minutes.

Only one Armor may be active at a time.

Conjuration

Unlocked at level 14