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Warriors of Ultramar is the second novel in the Ultramarines (Novel Series) by Graham McNeill. It was first published in 2003.
After the successful completion of their mission to Pavonis, Uriel Ventris and the 4th Company face their greatest challenge: to halt a tendril of the Great Devourer that is stretching towards Tarsis Ultra, a world the Ultramarines are sworn by ancient compact to protect.