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From Warhammer 40k - Lexicanum
It has been established that Garviel Loken survived Isstvan III.
When the [[Imperial Guard Hierarchy#Warmaster|Warmaster]] [[Horus]] betrayed his loyalist forces at [[Isstvan III]], the ''Dies Irae'' was caught in the [[virus bomb|virus bombardment]] but Princeps Turnet had the gigantic machine sealed against the deadly vapours and his crew watched on in horror as the world died around them, including many of the [[Death Guard]] [[Astartes]] they had been supporting only moments before. As the secondary firestorm erupted, without the benefit of cooling systems and ventilation the crew were very nearly overcome by the intense heat, but when the flames died and the extent of the Warmaster's plan became apparent, Turnet ordered his crew to attack the remaining Death Guard that had hidden in sealed bunkers below the enemy front lines.
Initially, Titus Cassar refused to carry out the orders and attacked Turnet with his sidearm [[autopistol]], but he was killed by his former friend and ally Aruken, who made his own ambitions quite plain. The ''Dies Irae'' went on to attack the remaining loyalist forces in the capital city, and was incidentally involved in the death of captain [[Garviel Loken]] of the [[Luna Wolves]], as he was trapped in the wreckage left in the titan's wake following his clash with [[Abaddon|Ezekyle Abaddon]].
As the siege of the Emperor's Palace ground on during the Horus Heresy, Horus ordered the Legio Mortis and the rest of the Traitor Titan Legions to breach the walls of the Palace whatever the cost. It was the Dies Irae that was the first to break the walls, throwing back the defenders that swarmed to protect the breach and allowing the hordes of daemons waiting for an opening to swarm in. This action earned it immortal infamy within the Adeptus Titanicus and its destruction was considered to be worth the cost of an entire Titan battlegroup.
