New Dark Spell: Invis Spell

My idea of a dark spell would be an Invis spell. As the name suggests this spell would create a radius that turned any attacking troop inside of it invisible, similar to the archer queen's ability. Since a ring of invisibility would be more over powered the spell would have a very short duration time and have a high training cost.

Invis Spell Level 1

Training Time: 30 minutes

Spell Duration: 1.5 seconds

Cost: 250 Dark Elixir

Unlock at level 4 Dark Spell Factory

Invis Spell Level 2

Training Time: 30 minutes

Spell Duration: 2.5 seconds

Cost: 400 Dark Elixir

Upgrade at Lab level 8-7

Invis Spell Level 3

Training Time: 30 minutes

Spell Duration: 3 seconds

Cost: 500 Dark Elixir

Upgrade at Lab level 8

I think these stats would help balance this spell and think it would be a great addition to higher level gameplay. Leave replies telling me what you think and how we can make this spell a better addition to the game!

This spell for one just wouldn't be good. We have many people making the same invisable spell idea not knowing of the existing spells that can help us without turning troops invisible. We have the Freeze spell that can obviously freeze defensive structures. The duration is even longer than this and probably less expensive. I don't think anyone will use a spell that lasts for 1.5 seconds. Just seems like a bad spell idea to me, we just don't need it.