Kinda ironic to fanon them as shattered legions, with how much people have been ragging on the shattered legions for having too much airtime. Though I think post the Horus heresy and the second founding, the newborn chapters would be fiercely proud and protective of their legacy, the memmory of the primarchs still too painfully strong to even consider the sacrilege of blending geneseed.
Also, remember the fact that the MMs have been around since M32. I cant imagine they have had a struggle with materiel and wargear for nine thousand years. What I think is more plausible is that their chapter suffered misfortune they still are struggling to recover from. Maybe their chapter world turned out to be a tomb world, and they barely escaped with their lives and have been struggling to rebuild, with nearly no resources. Especially if they possibly had not been on good terms with the imperium beforehand.
Consider the Dark Hunters, shortly after their founding, their new homeworld was beset by the mechanicum renegades of the blind king, which led them to a deep distrust of technology and leaving them low on proper wargear due to poor relations with the mechanicum. But the MMs seems to be even worser off, what they did to annoy the mechanicum or imperial authorities must have happened a long time ago, since they are using a lot of ancient armor, effectively held together with chewing gum and string. Which might be a root of their anger towards mortals, since they are not doing their job to support them, and thusly fanning their rage against mortals and their estrangement even further. A selfdestructive downwards spiral.
A chapter master usually merely have to request something and the imperium provides it, due to ancient treaties and alliances. But if youve made enemy of the mechanicum and not having the exalted pedigree of a first founding legion, it might suddenly not be a high priority to resupply the MMs. Their willingness to sack a forgeship, the Archimedes Rex, directly suggests animosity with the mechanicum.
Last edited by Brother Lucian; 07-18-15 at 12:29 AM.