Explain it more. Maybe change the effects a little.
Hey, I was thinking about an invisibility spell, so I searched for it and saw this.
Are you wanting this spell to destroy anything in the mist ring permanently? If so, then I think that is too easy for an attacker, and is kinda just a juiced up lightning spell without the lightning.
If not, is it supposed to make your troops invisible or their defenses? I don't understand why you would make their defenses invisible. But if the troops, then thats what I was thinking about an invisibility spell, or I guess cloaking spell would be a better name, it would make your troops unseen by defenses, but not traps.
Also, if it is to make your troops invisible, then I agree with imaturkey.
I'm my trying to advertise an idea I had, but trying to understand if we were thinkig the same thing or not. I hope for replies and opinions. :)