Fel Corrupters were carrying an interesting mask, and you picked it up.
Quest Text Edit
As you examine the damaged mask, you hear strange sounds coming from within. If the mask wasn't damaged you might be able to hear the sounds more clearly.
O'Mally Zapnabber in Ruuan Weald might be able to fix the mask.
Ah, what's that you have? Let me take a closer look, <class>. Yes, yes... it's just what I thought it was. Here, let me fix this mask for you.
- 3000 XP