Aye, challenges have nothing to do whether or not they're Monstrous Creatures or Walkers, and everything to do with whether or not they're characters.
So non-character Monstrous Creatures like a Carnifex can't issue/accept challenges, while a character like a Wraithlord can.
And a non-character Walker like a War Walker cannot issue/accept challenges, but a character Walker like Bjorn the Felhanded can.
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