In a bit of a rut...

[rdonj]

Fomoria is more like giants with glamoured troops sprinkled in They are an air/death nation with some water/death minor, big sacred giants, and some cap-only recruitable glamoured troops (which are not sacred, excepting the nemedian champion). Anyway the entire point of the suggestion is to be as helheim-like as possible without being helheim. At least magic-wise. You could always go for vanheim if you were going for the glamour angle. Or TNN.

[Warhammer]

I wasn't sure what to do with EA Vanheim. They were the first nation I played, and I used to run a F9W9 bless, but after having more experience under my belt, I'm not sure how to play them where someone can't do what they do better...

TNN I have looked at a couple of times. I am entrigued, but I don't see the synergies. Air and nature with little death or astral means very little end game. However, playing 3-5 player games, we rarely get into end game situations anyway.

[Kobal2]

Yes and no. More like "you have crap giants with some glamoured troups sprinkled in". You've got some recruitable (and very nice) glamour cap only infantry, but probably won't have the resources to buy them because you want to hire as many (also cap-only) Unmarked sacred giants as you can.

You've also got glamoured Morrigans which you should really get to ASAP because they're bad-***, but they require Conj 6 Const 4 and 1 mage/turn each so they're really not as fast out the gate as Helhirdlings are. Finally, Fomoria has no blood.
So, really, not much in common with Helheim