Guilliman's suit of armour includes a helmet, for appearances more than protection. When his flagship was attacked by the Traitor Word Bearers at the start of the Horus Heresy, he was thrown into the vacuum of space unhelmeted, but fought his way back inside, declaring, "What does not kill me, is not trying hard enough.”

while the brethren of the Iron Hands are renowned as cold and dispassionate, their most senior Techmarine Malkaan Feirros believes they must temper their logic with emotion. for this reason he is known as the soul of the chapter, a living enbodyment of the qualities displayed by their primarch Ferrus Manus. Some may consider him eccentric or his wry humour illogical but as master of the Forge and Iron Father,Feirros is afforded great respect