Only the first Netherlight Crucible trait will work in PvP, Soultender Videx was removed from the Commander of Argus achievement and Concordance trait can be purchased nearly indefinitely.
Netherlight Crucible Traits & PvP
The first crucible trait Netherlight Fortification works in PvP. Other traits won’t work.
Soultender Videx Hotfix
Soultender Videx was removed from Commander of Argus requirement, because it seems the devs forgot to spawn the creature. Commander of Argus is an achievement that rewards Arsenal: Weapons of the Lightforged when you kill all listed rare Argus elites.
Concordance of Legionfall
The Artifact trait Concordance of the Legionfall can be purchased with Artifact Power nearly indefinitely.