New DARK ELIXER Spell: Curse spell

Hi guys i had an idea for an DARK ELIXER Spell!

Info: If you drop the Curse Spell it will create a dark little circle on the floor, and that dark little circle gives instant damage to: Buildings, walls, defence, Clan Castle troops. The Dark Circle is there for 10 seconds after you dropped it.
The damage from the Dark Circle does 10-20 damage.

Icon: Its just a bottle filled with Dark Elixer in it and around the bottle some dark aura (Sorry for no picture i dont know how to make it!)

Dark Circle: http://snag.gy/ik7pZ.jpg
Something like that :P (The base in the picture is NOT my base.

Costs: 5000 Dark Elixer (LVL1)
Damage: 10-20 (LVL1)
Duration:10 seconds
Type: Area Attack
Time to create: 40 Minutes.

That's just a lightning spell