Codex Chapter
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A Codex Chapter of Space Marines tends to follow the strict organisation and doctrines as laid in the Codex Astartes. The Ultramarines are the quintessential example, and most of their Successor Chapters follow their example. Other chapters, like the Dark Angels, have relativly minor variations in their organization and ways of fighting. Yet others, like the Space Wolves, simply ignore the organization presented in the Codex Astartes and follow their own ways.