This build is exclusively meant to accompany my Vizier Predasite build. Again, this is not a General Use build! Its singular purpose is to give the pet ridiculous stats so it never dies when healing your mech. If for some reason it does go down and you also cannot pick it up yourself, you have Master's Summons which you can use before diving back in.
I use this build alongside ZeroX4's wonderful Voidrig setup. In that guide, he recommends running [Inaros] and provides a basic build that only requires a single forma. It is completely serviceable.
I, on the other hand, am crazy and like to max out whatever I am running for its intended purpose. I also don't play the sand king at all these days, so I repurposed my Prime for this setup. Are you actively playing your dusty old 'Ros? With the [Inaros Prime] set only running ~40 platinum at the moment on warframe.market, you might want to build a second Prime for this purpose instead.
You can swap Arcane Pulse for Arcane Grace if you so choose, but I found that my 'frame doesn't really take damage sitting outside the bubble, and my pet benefits from Pulse's, uh... pulses. [Umbral Intensify] is only here to boost its companion mods to their final form.