Did you get a message from Malady to return to the vengeance?
Afaik you need to visit all Source masters even if you don't get Source points from them anymore.
The elf is pretty easy to miss, also you could "fail" a source masters quest like not saving the dude in Black Pits, but you still need to talk to the master after.
Last edited by Victor_Creed; 10/11/17 11:32 AM.