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I'm just now turning my attention toward Underworld, and I've got a question.

I'm interested in the Skaven warband from Nethermaze and the undead warband from Gnarlwood. Will those warbands ever be released on their own, or do I have to buy the box sets to get them?

Sadly not, by the looks of it.

As SamusDrake already wrote there is no standalone box for these warbands.

But besides the name giving starter box there are also so called "Rivals of..." boxes which still contain the warbands whereas the starters are (as far as I know) discontinued.