Among all Immaterium armies ”Heirs of the Dark Foundry” are the longest-lived and most resilient of all… Their obsession with defense and protection of their bodies has made them almost invincible ultra armored soldiers. You can only pierce their armor with the most penetrating of missiles, as if they were armored tanks. The dark foundry allows them to create new technology and armor through classic methods and alchemy. The new weaponry and armor is made of a conglomerate of very resistant materials imbued with the power of the enemies blood and soul, which provides greater resistance to spells and incantations. The Heirs of the Dark foundry army never stops and always expands slowly but steadily over the millennia…”