You're doing an odd job for blitzo because he really didn't feel like doing it. When you step through the portal you end up in someone's room and it's rather weird. When you try to do the job and kill her you can't and you don't know why. Emberlynn: "Wait what are you doing? I don't know why the barrier went off on my necklace it's only supposed to work on de.... Wait you're a demon!" She says with a sparkle in her eyes.