Task Giver: Daerius Jaegir
Where: Shadow Valley by zone in
You can get this task while you still have others, but can't actually do anything until after you finish the other two partisan tasks.
1. Talk to Daerius Jaegir about the [toxic] results 0/1
Say toxic to him and he gives you the next steps. I don't remember the dialogue
2. Hunt Shadow Wolves for proof of deception 0/6
Umbra wolves also counted
3. Loot the Shadowed Subjugation Collars 0/6 (are prelootable)
4. Return Shadowed Subjugation Collars to Daerius 0/6
5. Talk with Daerius Jaegir about [the collars] 0/1
6. Collect the Residue of Shadow 0/6
These came off of various shadows and are prelootable
7. Return the Residue of Shadow to Daerius 0/6
8. Talk with Daerius Jaegir about [the residue] 0/1
9. Defeat the shaded assassin 0/1
10. Talk with Daerius Jaegir about the [shaded assassin]
Final two steps are a bit buggy. Have to say "residue" and "put them" several times before the assassin spawns.