[Baalz]

The strength of Niefelheim's troops is really their cold aura. What you want roughly (specifics will vary depending on what you have available) is a couple of cold immune guys (undead, or give them relevant items) with high defense (25+). Because the giants are so large, only a few can attack at once, so for relatively cheap you can get a couple of linebackers that'll hold them back for a good amount of time so your mages have a chance to work. The typical bless for Niefelhiem is N/E, so I'm assuming its something like that. With Arcoscephale what'd work well is a communion of 8 or so mages casting..say...orb lightning. 4 masters + 4 slaves makes orb lightning practically free (you can cast it all day long) and if your masters start at 3a (seems like that's what EA Arco has available) you're throwing down 20 or so AN attacks per round. Fried giant in no time!