The highest level a "bro" can achieve as a bro. There is only one Bromulus Prime in the world at any given time.
Dude A: "Dude...my Lego VIP membership is almost better than my Costco membership, but not quite…now I got my Costbros and my Legbros!"
Dude B: "Damn bro....I think this makes you Bromulus Prime!!!"