Ancient of Rites at chaldea

Rylanor, known as Ancient Rylanor and Rylanor the Unyielding, was a Venerable Dreadnought and hero of the Emperor's Children Legion during the Great Crusade. He served as the IIIrd Legion's "Ancient of Rites," and had been mortally wounded battling the Eldar in the late 30th Millennium, solar decades before the outbreak of the Horus Heresy. Following his wounding, Rylanor was interred within the adamantium shell of a Contemptor Pattern Dreadnought.
Rylanor was only part of the Primarch Fulgrim's Honour Guard by tradition, though he was increasingly troubled by the direction the IIIth Legion moved in after the assault on the xenos world of Laeran. At the last minute, he traded places for the combat drop onto Istvaan III with Captain Saul Tarvitz of the 10th Company, who was supposed to go instead as one of the Emperor's Children Loyalists marked for betrayal and death.

Betrayed unto his own death by the duplicitous actions of the Warmaster Horus, Rylanor rallied the surviving Loyalist Emperor's Children and fought against the Traitors during the Battle of Istvaan III. He would survive the battle, and spent the next ten thousand Terran years planning to gain vengeance upon the man he truly blamed for the great betrayal -- his own Primarch, Fulgrim. Though Rylanor's attempt upon the Daemon Primarch's life ultimately failed and finally ended his own long life, it would leave a grim mark upon Fulgrim's soul forever after. Upon his death he was summoned from the past to save the humanity's future. In chaldea, as servant BERSERKER class. Servant, now he will serve to protect the humanity's future and past.