'''{{PAGENAME}}Issoros Praernon''' was a veteran warrior of the [[Ultramarines]] and served in the [[Chapter]] and served in the 's [[Victrix Guard]]. Thanks to his sacrifice in battle, the Ultramarines [[Chief Apothecary]] [[Corpus Helix]] managed to evacuate precious geneseed [[Gene-seed]] from the recruiting world of [[Cietara]] before it was overrun by [[Mortarion]]'s [[Death Guard]] in [[M42]].{{Fn|1}}