I know. I've traveled through there too. I've fought the Zuma.
I just only assume that what the Zuma keep laying around to fight monsters is a lot less than what they're capable of. Also, honestly, who knows if they possess any powers we're not even aware of?
They almost certainly do.
Simplest example is recruitment. They must have favorable recruitment mechanics that we do not fully understand to even maintain an army at all in their low-population, low-gold, low-food lands. Given the quite large size of that army, they must have a very significantly different mechanic; one which we do not understand. While the rumblings a while back could have been indicative that they were under strain, and they seem to have at least some threshold of food demand, even with several tens of thousands of CS I wouldn't want to tangle with the Zuma; not unless every realm were committed to a very long-term war.
But, if the new estates go well, and we are all able to expand a bit more, especially given the shockingly low monster spawns we've seen recently... fighting the Zuma could be possible in the next 2 RL years or so.
And, beyond the dream of creating a hegemony of the Maroccidens with me as its head, burning Nightmarch to the ground and sticking Artemesia's head on the end of a spear is my next biggest dream.