There is the 'Murderflock' formation that uses Scourges, however it's also Apocalypse only, doesn't give Skyfire, and is in 'Warzone: Valedor' along with a couple of other good fun Apocalypse formations.
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One does ones best.
A stitch in time, saves nine.
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The Templar & The Alien - Battle Report
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No Rest for the Wicked, a UK based Warhammer 40,000 LARP