Chaos magic. Is it necessary?

Hmm... And how do you halve the defense with a light spell or chaos magic? Or with the Fire Lord perk in chaos? But it doesn't reduce it by twice and it's not permanent...

Well, yes, by 50%. But isn't that the same as halving it? :) And we were talking about Armageddon (fire magic). And the perk in light grants immunity to the Fire Lord's effect, meaning it won't reduce the armor on your own units and the damage will be halved, so it's all logical ;) And reducing the enemy's defense by half is more than enough to deal significant damage.