>>96334843
>so overdosed that they inevitably turn into him
Save for that part is not far off the mark. The chemical compounds Lucius and his warband use to get high also see use as chemical warfare agents. Other Astartes who don't have their extensive history of substance abuse will simply not be able to handle it. This was a plot point in pic related when Fabius the Potion Seller decided to bargain with Lucius to field test some new combat stimulants, because between Lucius's combat veterancy and the tolerance he had built up over ten thousand years of recreationally dosing himself with chemical WMDs, Fabius figured that he couldn't synthesize a more ideal candidate to try his strongest potions on.