The Deed is Done

Cluster Clutch is the next part in the chain.

Spoiler

Wrathion says: Excellent work, my friend. You've proven that a single skilled assassin can strike a decisive blow where a whole army may fail.
Fahrad says: Huh! A lucky blow against an unprepared opponent.
Wrathion says: If you wish to continue our work, we will need some additional supplies.
Wrathion says: The gems you collected will be able to augment the weapons I gave you. But, I require another ingredient. It will come from your next target.
Wrathion says: Her name is Nalice, and until recently she stood at Wyrmrest Temple as the representative of the black dragonflight. Now, she's on the run.
Fahrard says: We've just located her here, in the caverns of Karazhan. Fearful for her life, she is researching arcane secrets buried beneath the foundation.
Wrathion says: She's surrounded herself with a group of deranged dragon cultists. They may not be right in the head, but they're well armed… and dangerous.
Wrathion says: I hope to see you back from this mission alive, but, if I do not, I want to say I've enjoyed seeing you work. You're a credit to your race. Good luck.

The seventh quest of the chain to obtain [item=77949] and [item=77950], Fangs of the Father.

1. 
   
2. Proving Your Worth
3. 
   
4. A Hidden Message
5. 
   
6. To Ravenholdt
7. 
   
8. To Catch a Thief
9. 
   
10. Our Man in Gilneas
11. 
    
12. Assassinate Creed
13. 
    
14. The Deed is Done, Rewards - [item=77945] and [item=77946]
15. 
    
16. Cluster Clutch
17. 
    
18. Our Man in Karazhan
19. 
    
20. Blood of the Betrayer
21. 
    
22. Victory in the Depths, Rewards - [item=77947] and [item=77948]
23. 
    
24. Sharpening Your Fangs
25. 
    
26. Patricide, Rewards - [item=77949] and [item=77950], Fangs of the Father
27. 
    

So basically any rogue with access to a 3/8 raid instance can get the daggers for mere 10k gold. Neat.