Non-viking units and runes

[camelotcrusade]

I have a couple of dwarves in my army and also an assassin (freebie on third island... yay) and they seem to randomly have runes to use. Sometimes defense, sometimes attack and luck, sometimes just luck... I don't think I've seen all three available yet.

I don't have any Soothsayers providing friendly runes (and honestly, I'm not sure if this ability even works?) and I haven't cast that spell to give them any... so I am wondering where these runes come from.

What have you guys seen?