- It became a black mark on their history as imperial territories burned in the fire of betrayal. - When the Horus Heresy began, vostroyan leaders initially refused to send manpower. - To atone for their shame, the vostroyans now produce large quantities of wargear for the imperium. HARMONY WITH THE ADEPTUS MECHANICUS - Vostroyans are closely aligned with the Adeptus Mechanicus, who provide them with firepower and support. - If your current used Support Cap is equal to or higher than your current used Population Cap, Harmony with the Adeptus Mechanicus is achieved. - All Infantry, Commander, and Vehicle units, excluding Aircraft, receive a significant boost to their health while Harmony is maintained. Specialized Mechanicus equipment becomes available to us, either as weapon upgrades or new units. - Vostroyan HQ Building. Produces builders and various Commander units. Also has an underground tunnel system incorporated.