[Agema]

You could forgo Morrigans and just raid with a Nemedian champion leading 10 Nemedians, which should chew through light to middling PD comfortably. Even better, you can seed your enemy's territory with them before you declare war. Losing half a dozen provinces on the first turn of warfare is pretty depressing. For that matter, a Nemedian champion could make a standalone thug with careful item use. The biggest downside is only A1, so they'd need a gem for mistform or some other way of fending off attacks.

Although I do appreciate the point that fighting a stealth war might be more of a niche tactic when you assault your opponent directly with the existing Fomorian troops.