>>96958318
The reason is that Forgebreaker was originally Perty's signature possessed warcrime hammer and some retard in Nottingham decided it should be a prop in the homoerotic fratricide of Ferrus and Fulgrim.There is no sensible, well reasoned and fluffy explanation for it beyond needing Perturabo to have Forgebreaker during the Heresy so a dumb retcon looked less like a dumb retcon.