User blog comment:Twilight Despair 5/Hell Trial Theories/@comment-5173960-20130415040342

I think the last trail would be to turn a demon back to a soul. The demon being Bela. The boys will come across Metatron and he will tell them to change the new " Queen of the Crossroads" (Bela) for the final trail. Sam has to give her a piece of his soul and it changes her into a human soul. Hence the feeling of "getting your spin ripped out thru your throat.