With the release of the 2nd Edition of The Horus Heresy (Age of Darkness), many of the rules found in Tempest have been updated and moved to the Liber Astartes (for Loyalists) and Liber Hereticus (for Traitors) books.
The number “39” likely refers to one of the following: Horus Heresy Book Five Tempest Pdf 39
Check our guides on Horus Heresy Book Six: Retribution and The Siege of Terra Campaign Books . Happy wargaming! With the release of the 2nd Edition of