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: 16 Arcane Power

Hurl a barrage of arcane projectiles that deal 400% weapon damage as Arcane to all enemies near the impact location.

Arcane Torrent damage is increased by 305% weapon damage every second, up to a maximum total of 1010% weapon damage as Arcane.

Secondary

Unlocked at level 12

Cost: 20 Arcane Power

Summon a Familiar that attacks your enemies for 240% weapon damage as Arcane. This companion cannot be targeted or damaged by enemies. Lasts 10 minutes.

Conjuration

Unlocked at level 22

Cost: 25 Arcane Power

Focus your energies, increasing your Armor by 35% but decreasing your maximum Arcane Power by 20. Lasts 10 minutes.

Only one Armor may be active at a time.

Conjuration

Unlocked at level 28

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