How many RPs can ya be in?

[Okor]

How would armies work, like if I were to be in my universe a Kell (leader of an entire Clan/House of Fallen), how would that be handled if their in the hundred of thousands area, only theoretically assuming i GET that high.

This I honestly have no idea. Strictly speaking you're limited to five Secondaries per level of progression, so you would never approach anywhere near those numbers to begin with.

I recall being limited to personal NPCs, but judging by New Babylon, Ambrosia, etc, you can accumulate enough influence to get people to follow you.

However, most primes lack the power to summon so many NPCs. Just summon a few recruiters, and send them out to gather some useful troops.