Elemental Forums
As far as I can tell you can spam Obscuring Fog as much as you want and the Dodge bonus stacks each time, quickly rendering you unhittable
I used this spell to try to win arena with some lower level heroes. Let's just say it gets you to the last fight, but it's not that effective against Umberdroths and Obsidian Golems. I think it they should probably make it not stackable, but it is the only Air Spell worth casting most battles.
On another note, casting it 20 times in the same fight makes the game lag like crazy. 
It comes from the "Book of Winds" technology along with Eyes of the Eagle and Escape. "Book of Winds" is a tech very early in the Magical tree, and is quite useful.
Personally I'd like to see some more techs like "Book of Winds" which give interesting spells.
Obscuring fog benefits from air and water shards, but requires no rank in any magic school, so it can be cast by the sov or any imbued champion.
I guess it should require at least disciple rank in both water and air, as a way to balance it, since it is one of the best spells right now…
I must have thought that only opened it for Air Magic Mages. I used 300 mana to try and win that Arena fight, but the enemy still got hits due a high accuracy. I am okay with it stacking, but I would rather it be cast once and have a connection to water or air.
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