Gerkenshtein:
Exellent! As you mentioned, the strongest of the creatures is the Blood Succubus. They are also known as Succubus Disciples, but that is beside the point.
I need you to kill these creatures and extract from them their Essence. I need you to collect 10 Succubus Essences from their corpes before they turn to ash and bring them back to me. As soon as you return I can finish my report.