Here is the build for the umbral lightsaber/katana build i put up, make sure to use electric as base for the cc, and your armor, alongside [Adaptation] and guaranteed heals from healing return and procced heals from grace will keep you alive. You can even easily do the endurance/laser test on lua without needing to go into kid mode. Block to stack up [Adaptation], and this will [Shred] high level anything while being resilient enough to take a beating.
I managed to facetank a slightly bugged lvl 150 lech kril with this, and even tho my hp was going wild jumping from low to max (normal attacks didn't work on him even after lighting on fire, so i kept up the gas proc and he slowly suffocated through literally 0 points of damage) thanks to [Healing Return].