With low investment, by just adding 1 Rank on each [Umbral Vitality] & Fiber you will get more out of those mods then out of their normal counterparts while using all 3!

This is my Endgame [Inaros] able to survive 2 Hour Arbitrations with maxed Mods.

So this is the perfect starting Point for a Build with 0 Forma to get into Arbitrations and your Endo to be able to Rank up all those expensive Mods!

Why no max Rank [Adaptation]?
Rank 10 gives max DMG reduction, further Ranks increase buff Duration. Not worth the additional drain!

WARNING:
As always Aracanes only enhance the build, they are not needed to play it ;)
Same goes for Exilus, Enhances gameplay but not needed.