Hey i just made an Orc Warlock and noticed something that may be a bug.
I did the quest that Ruzan gives which is to kill vile familiars to gain the spell summon imp.
After handing in the quest and receiving the spell I was told to go to Zureetha Fargaze the NPC right next to him to hand in a completed quest which gave the rewards of a dagger or staff for killing familiars.
After handing this in, i realized that i still had the active quest to kill 12 vile familiars which gave the exact same reward... After killing the 12 I was able to hand in the quest again and receive the same reward and exp again.