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: 15 Arcane Power

Summon a multi-headed Hydra for 15 seconds that attacks enemies with bolts of fire dealing 165% weapon damage as Fire.

Only one Hydra may be active at a time.

Force

Unlocked at level 21

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

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

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