Yep, I think it means "warrior".
As for tough Kingdoms campaigns, I haven't found any yet. In my view the Kingdoms campaign are refreshing and fun change from vanilla but they aren't really any harder. The nearest thing I found to a hard campaign was the Apache, but even then it was mostly just a challenge to see it through to the end with all the marching endless stacks around with no roads.
You want a challenge, the best place to find it is mods.
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