The book provides the final set of Boarding Action rules for the 9th Edition era, including unique Enhancements and Stratagems for the Dark Angels, Blood Angels, and Chaos Space Marines.
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Finding a direct official PDF link for Arks of Omen: The Lion The book provides the final set of Boarding
Since this was a limited-release campaign book, it is no longer in standard distribution. You can typically find it through: arks of omen the lion pdf link