The upgraded version of my bladestorm build that uses all 3 umbral mods. A decently strong build without dipping into subsumed abilities. The build shown will grant over 1500 armor and health, and as long as you use bladestorm to get most of your kills, Trickery should keep you invisible for as long as you'd need.

Optional modifications:

• Ultimatum can be swapped with Crepuscular to gain more ability strength and crit damage when invisible, either through Trickery or Smoke Shadow (crepuscular is not an option on this site as of writing).
• Trickery can be swapped with Molt Efficiency, and Transient Fortitude with Primed Continuity to give a total duration of 23 seconds to smoke screen so long as shields are active.
• Rising Storm can be swapped for the new Teleport Rush, and regular finishers will eliminate the need for Trickery as smoke screen's duration can be kept up indefinitely. Your Shadow Clones will either need to be built for combo duration/gain, or you will need to use the Naramon focus school to offset the loss of the combo counter once the timer runs out.

Archon Shards:
Anything you want really, though I'd recommend more duration, parkour velocity, or strength. Duration would be more beneficial than strength only if you intend to drop Trickery in favor of Smoke screen.