>>5376115At some point TaloS ought to get some sort of teleportation link to the Onus Probandi's armory, like having a bag of holding button and can have any weapon he want materialize in his hands. You better believe he'd make use of Rad Weapons for sure.
In some fairness, Alpharius notes that he was fighting at "half strength" and when reunited with Omegon is able to down near a dozen of the constructs before having to flee. It also helped that Omegon's special xenos armor seemed to resist Guass weapons.
In any case, such foes like the slaught exactly the type of opponent TaloS is talking about if anyone says "you're a primarch why do you need upgrades? Aren't you invincible?" he would point to these specific types of foes that make even a Primarch sweat and why he should transcend into a glorious Dreadnought body.
Now the other question, what to base it on? A Telemon, the Arimger, or even a Domitar?