This quest is exclusive to Warlocks early in the Human quests. This quest teaches you how to train new abilitys and teaches you Immolate.
Speak to Drusilla La Salle and purchase the Immolate ability, then practice casting Immolate 5 times on a Training Dummy south of the entrance to Northshire Abbey
We must take care in how we speak around the abbey and its environs, but don't let that deter you from the path of power.
I want to show you one of my favorite spells. It will allow you to set an opponent on fire, damaging the enemy immediately and continuing to do more harm over time. I'll show you how it's done, and then I want you to go try it on one of the Training Dummies south of the entrance to the abbey.
I see you have already mastered Immolation! I look forward to instructing you in the future. Do not forget to return for further lessons as you grow in power.