I was thinking a new aura and found this MVP and maybe the revolving shadow-balls could be taken off this
http://file5.ratemyserver.net/mobs/2087.gif
I was thinking it could be re-coloured to give a range of different colours too.
ItemName : Shadow Orb Aurora
Description: A Shadow Aura created by an evil Queen.
Cost: 80 Event Tokens
Equipped in: Middle
Defense: 2
Weight: 10
Slots: 1
Stats: All Stats+20, Matk+8%, Damage+8%, MaxHP+8%
Just an idea maybe.