Talk:Evolution: Death Storm/@comment-24.209.18.250-20121116114025/@comment-5266525-20121216220733

That's not what Unique Passive means. A passive being unique means it will not stack with another identical item. Since you can only buy one of this item it doesn't really matter if it's unique or not.

But yes, it stacks with Void Staff and Arcane Mastery both.