Mournival - History: The word Mournival, according to the Iterator Memed, was drawn from the ancient Franc (French) language of Terra and referred to a hand during a card game that included one of each of the four face cards, which was usually a winning hand.The origins of the Mournival are uncertain as the tradition either began soon after Horus was installed as the leader of the Luna Wolves Legion when the Great Crusade reached his homeworld of Cthonia or was an outgrowth of the informal warrior lodges that began within the Legion after their conquest of the world of Davin only 60 years before the start of the Horus Heresy.When the Heresy began, there had been 13 Luna Wolves in total who had been members of the Mournival, including the four final members before the Mournival was shattered at the start of the Heresy. After the Heresy began, the Mournival was brought back to full strength after the Battle of Dwell with two new members, such that 15 members of the XVI Legion had served within the body by the time its existence was brought to an end after the death of Horus at the Battle of Terra.Whatever its origins, the primary duty of the Mournival was to advise Horus in all aspects of strategy, tactics, diplomacy and all other matters that concerned the Warmaster or the Luna Wolves Legion. The Mournival could be used to serve Horus' political needs at times when he dealt with the other Primarchs or other Imperial organisations like the Imperial Army, various Imperial Planetary Governors, the Council of Terra and the Mechanicum.Every member of the Mournival had the helmet of his Power Armour marked with a phase of the moon imprinted on the helmet above the right eye. At the time of Garviel Loken's ascension to the Mournival, Abaddon wore the Full Moon, Aximand the Half Moon, Torgaddon the Gibbous Moon and Loken the New Moon that had also been the phase worn by his predecessor Hastur Sejanus.After Horus' corruption by the Ruinous Powers of Chaos following his healing by the Chaos Cultists of the Serpent Lodge on Davin's moon, the Mournival became divided. Abaddon and Horus Aximand gave themselves over completely to their beloved leader and chose to follow him into the worship of the Chaos Gods, while Torgaddon and Loken remained loyal to the Emperor of Mankind.The Mournival was broken during the Battle of Istvaan III as the majority of the four Traitor Legions at Istvaan III turned on the Loyalist Space Marines who remained within their ranks, and Loken and Torgaddon faced off against Abaddon and Aximand just before Horus' 63rd Expeditionary Fleet began its final orbital bombardment of the Loyalists' positions and ended the battle. Loken and Torgaddon were believed to have died during that bombardment, though Loken survived to later serve the Emperor as one of Malcador the Sigilite's special Space Marine covert agents known as the Knights-Errant.After the deaths of Garviel Loken and Tarik Torgaddon on Istvaan III, the remaining members, Abaddon and Aximand, debated who their replacements were to be before the attack on the Loyalist-held planet of Dwell. After the successful invasion, Sergeant Grael Noctua of the 25th Warlocked Tactical Squad and Captain Falkus "Widowmaker" Kibre of the Justaerin Terminator Squad became the successors of their Loyalist brothers.