The quest “To Kill a Queen” has bugged quest rewards.
After you kill Queen Ansurek and turn the quest in the following reward(s) are not applied:
The quest states you will receive 5000 Reputation with The Vizier (and the accompanying 2 renown levels with the Severed Threads faction).
However, if you are already Rank 9 with The Vizier you are instead given: 2500 Reputation with The Vizier and ZERO (0) Renown with the Severed Threads.
Thankfully, you do still receive the Enchanted Runed Harbinger Crest and the Void-Touched Valorstone (containing 250 Valorstones).
Until this is fixed I guess hope you’re at or below Rank 7 with The Vizier before attempting this quest…