User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-131.239.63.5-20150819181135/@comment-24834479-20150822014443

1. Yes tricksters can shapeshift, but I don't think they can become inanimate objects. 2. There is no current plan to bring back Artemis. 3. Leviathans are immune to angelic magic because they predate them, but the magic that witches tap into is more of a mystery. This magic is more universal. 4. Hellhounds are loyal to the crossroad demons that they work for. The writers don't have an official answers, but the most common theories are that they were created by Lucifer, Lilith, or Cain. 5. We like to keep the angel blade's killing effect to the Angels and Demons. That way the Winchester can have a challenge when fighting a MOTW instead of just having the right writing everytime. However, in the future it could be made that angels blades work against monsters.