It's only the Royal Sewer Hammer that creates a set w/ Fury Fighter (not sure about Fortified + Royal Sewer Hammer) - I don't think the other Sewer weapons will create a set bonus like Royal Sewer+FF. I am certain that this was the extra item set for warriors that Asommers said in his announcement thread.
He just said "an" item set for Warriors, so maybe it's just FF+Royal Sewer, and Fortified+Royal Sewer may not work.
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