The Raven Guard try to regroup from Isstvan in the latest Horus Heresy novel by best selling author Gav Thorpe After his legion is decimated during the Istvaan landing and the initial battles of the Heresy Corax, Primarch of the Raven Guard, returns to Terra. Here he attempts to find a way to restore his legion. (I’ll need to check with editorial for more detail, don’t know much about this one yet)