|Chaos Space Marine Legion|
The Iron Warriors were one of the nine legions that turned traitors during the Horus Heresy. Their Primarch is Perturabo. The Iron Warriors are masters of siege warfare, which made them rivals with the Imperial Fists. After the Iron Warriors turned traitors and the Imperial Fists stood loyal, this rivality became pure hate and the whish to destroy the other. They are also known for using biotics to replace the "dark gifts" of the Chaos Gods, thus any mutated limb is cut off and replaced with a biotic.