it's not clear what powers Melisandre or Quaithe have. Melisandre is an excellent example, as she's prominently featured in Game of Thrones. She arrives in season 2 with visions of prophecy ...

Quaithe still has a part to play ... not all of the characters who survived until the end of Game of Thrones will survive until the end of A Song of Ice & Fire, and not all of the characters ...