This [Loki] build focuses on high Duration to stay invisible for as long as possible. We utilize a subsumed movement speed or defensive ability for a QoL increase in efficiency or survivability.
Infested Mobility is chosen because it significantly your speed in all content but Fire Walker or Molt are also serviceable. Dispensary and Null Star can be use to increase your efficiency or survivability respectively. Quiver can be used like Invisibility but for allies or objectives.
[Sprint Boost] can be replaced with other Auras as you see fit; [Energy Siphon], [Enemy Radar] and [Corrosive Projection] are common choices for different situations or playstyles.
Parkour Velocity and Sprint Speed get you from point A to point B faster, as it's often used for quick mission types like Spy; however, this build is also serviceable in Endurance missions like Survival due to [Hushed Invisibility].
[Rolling Guard] and Shield Gating combine to help you deal with unavoidable damage, like an unlucky Bombard rocket aimed at a teammate.
Arcane Strike is a placeholder here, as I frequently pair [Loki] with Melee weapons for stealth damage multipliers. You can replace it with Arcane Consequence for higher mobility or for another damaging Arcane of your choice. Arcane Agility can be used in rank 0 Combat Discipline builds if you don't want to push headshots.
CREDIT: Build write-up originally by -NICHE- and tweaked for Helminth meta.