It's the old story of "nation creates superweapon, underestimates it and is obliterated along with its foes and the rest of the world, and yet the war still goes on." Well, maybe not
old, and the war on Siraus did kind of end. For a time. The coming war is a new one rather than a restarting the old one. Kind of.
Primarch of the Pulseforged 
Legendary Artifact Creature - Primarch
Indestructible
Other artifact creatures you control get +0/+X, where X is your devotion to red.
Whenever another artfact creature you control attacks, it deals damage equal to its power to target creature an opponent controls.
5/5
Primarch of the Ruinforged 
Legendary Artifact Creature - Primarch
Indestructible
Whenever you cast an artifact creature spell, each opponent loses X life and you gain X life, where X is your devotion to black.
, Exile three cards from a single graveyard: Put a +1/+1 counter on each other artifact creature you control.
5/5
Primarch of the Thoughtforged 
Legendary Artifact Creature - Primarch
Indestructible
At the beginning of your upkeep, you may draw up to X cards, where X is your devotion to blue. If you do, discard that many cards.
Whenever another artifact creature you control dies, return target creature an opponent controls to its owner's hand.
5/5
Primarch of the Throneforged 
Legendary Artifact Creature - Primarch
Indestructible
At the beginning of your upkeep, put X 1/1 white Throneforged artifact creature tokens onto the battlefield, where X is your devotion to white.
Whenever you cast an artifact creature spell, you may exile target creature an opponent controls until an artifact creature you control dies.
5/5
Primarch of the Hopeforged 
Legendary Artifact Creature - Primarch
At the beginning of the first main phase on each of your turns, add
to your mana pool, where X is your devotion to green.
Whenever another artifact creature enters the battlefield under you control, you gain life equal to that creature's combined power and toughness.
5/5
I figure that the primarchs have transcended their Golem origins and do in fact deserve their own creature types (I'm less certain about their 'forged, but I felt I could go that way). They mostly give me a strong devoted vibe, which is why each gets a devotion ability. And of course, each gets an ability caring about other artifact creatures in some way. The Pulseforged primarch looks weird enough to me with its very unred pumping, but high toughness is supposed to be part of the Pulseforged identity.
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I hope the designs stand up to your vision on closer inspection as well.