Main focus is on Rhinos Iron Skin and Roar!!

[Iron Shrapnel] will allow you to recast your Iron Skin that comes very handy when you're running a high lvl mission and standing in the middle of a fight without the risk to die when you're waiting for your shield to crack down to recast it.

Arcane:
Arcane [Guardian] give you 600 armor for 20sec then you can recast your Iron Skin when the buff is up gain even more Skin HP and [Guardian] does lower the Skin vulnerability since you gain 600 armor on 20sec 20% proc chance means less dmg.

Note:
When u use umbra forma u can save forma on iron shrapnel and power drift
Feel free to text ingame Username: -Denoxx-