All purpose Rhino Prime melee build.
How to use: Charge a decent size group of enemies to capitalize on armor for Iron Skin.
Streamline is added to help counter the negative effects of Blind Rage.
Primed Flow + Arcane energize is used since his abilities cost a small fortune of energy to cast with the -25% efficiency.
Everything else is to help build his armor and boost strength for his iron skin ability for survivability.
Arcane Guardian is optional, but it is nice when the proc happens for additional boost to Iron Skin.
Duration is still 100% with this build keeping the standard 30s for Roar, use for self/team buffing when Iron Skin doesn't need to be recast.
Empowered is used to replace Stomp to add a higher strength bonus to get even more of a multiplier from Iron Skin while having a more reasonable energy cost.
Also notice that Iron Shrapnel is at a rank 0, even though there are 3 extra points to spend allowing us to max this mod out. Leaving it at rank 0 and keeping the extra points in reserve will allow Rhino to start a mission at 65 energy, ensuring that you are able to get 1 cast of Iron Skin for survivability at the start of the mission.