[Shield Of Shadows] requires 214% power for maximum (90%) damage reduction, that's why we need [Power Drift] and [Blind Rage].

[Health Conversion] adds up to 1350 armor i.e. 81.8% damage reduction to the existing base armor of 125. Combined, that's 83.1% reduction.

[Adaptation] provides up to 90% damage reduction.

[Quick Thinking] is the backup. It increases the HP by 240% * 188 = 450 and is indeed affected by all reductions above.

Especially since the efficicy for [Despoil] is crappy, the build is supported by Equilibrum.

Adaptation is probably the weakest mod here, as it requires rampup and does not protect well against multi-type damage. It could be replaced with [Primed Flow], providing a larger energy buffer for Quick Thinking.

If my math is not off, this build can survive hits up to (740 + 450) / 0.1 / 0.169 / 0.1 = 704k.