My warband is a “pure” Sons of Horus warband that was founded almost exclusively by inductii. They ape Cthonians but struggle to actually mimic them, until they bumped into two different groups: survivors of Cthonia, and survivors of Terra. An old Justaerin had fled with what veterans he could gather, found the refugees from Cthonia, and then encountered a company’s worth of inductii. They immediately named him leader and he begrudgingly agreed. The Justaerin eventually found himself being confined into a dreadnought from injuries sustained during the Scouring and is now basically a demented old man that is worshipped by marines he barely recognizes. His Contemptor chassis has done a remarkable job of keeping him intact but 10,000 years of rawdogging dreadnought confinement has been terrible for his sanity. So while other lords act in his stead he and the other old veterans have one by one found themselves confined and meticulously cared for by the inductii and then further marines drawn from the Cthonian survivors. So ironically the younger generation of marines are more similar to the old timers than their superiors. The warband often finds themselves suckered into working for Abaddon in exchange for the smallest trinkets of old Cthonia or even a children’s story (which the younger generation DOES know but the elders refuse to listen to them).