[Sandman]

I've had a spin with Neifelheim, and I'd have to say that using nothing but Neifel giants wouldn't occur to me. I'd certainly build some to act as the core of the army, but mixed in with plenty of normal Jotuns as well. Say, 25 Jotun spearmen for every 5 Neifels. Much less chance of getting swarmed, so there's no need for an excessive nature bless.