Stormwake, the Tempest's Reach (heroic)

Source
This item drops from Al'Akir in the Heroic version of Throne of the Four Winds.

Note
This weapon currently displayed in the tooltip is the caster version (intellect) of this weapon. The melee version (strength/agility) of this weapon has the following attributes:

949 - 1764 Damage Speed 2.60 521.7 DPS No spell power increase.