During the second battle round, the Tactical Doctrine is active for your army.

During the first battle round, the Devastator Doctrine is active for your army.

After pounding the foe with heavy weapons, warriors advance to lay down a hail of bolter fire before charging forth with chainswords roaring to finish the foe.If every unit from your army has the ADEPTUS ASTARTES keyword (excluding AGENT OF THE IMPERIUM and UNALIGNED units), this unit gains a bonus (see below) depending on which combat doctrine is active for your army, as follows: When the Adeptus Astartes fight, they employ a set of combat doctrines to eliminate the enemy. We also recommend that Blood Ravens use the Stalwart and Knowledge is Power Successor Chapter Tactics, as described in Codex: Space Marines, to best reflect their Chapter's preferred methods of waging war and their determination to discover their hidden past.

For all rules purposes, we suggest that the Blood Ravens are considered to be an Ultramarines successor Chapter, and so can use all the rules for an Ultramarines successor Chapter that are presented in Codex: Space Marines and Codex Supplement: Ultramarines. While the Blood Ravens are of an unknown founding, their codes of battle align with those of the Codex Astartes. Coupled with their methodical combat doctrine, this practice has attracted derision from some headstrong Chapters, but in battle the Blood Ravens fight with a zeal and fury equal to any other Adeptus Astartes force. The Blood Ravens' origins are unknown even to themselves, and this fact perhaps contributes to their fervent pursuit of knowledge and ancient lore. Guided by their unusually powerful Librarians, the Blood Ravens strike with prescient, calculated wrath, studying their enemy closely and rarely deviating from their carefully forged battle plans.

Wrath of the blood ravens