User blog comment:FTWinchester/Premiere/@comment-1509826-20131009181531/@comment-5619706-20131011025659

True. The demons also got stale until Abaddon. Even Crowley eventually grew tiresome for me. Introducing new creatures poses a risk that it may be uninteresting, but there is also a chance that it would be really good if handled well (Carver made the Leviathans awesome in Purgatory, so he shouldn't really be that scared, imo). Thing is, if they don't start introducing new creatures, they still lose. We can't have conflicts about angels and demons until season 10 without being a bit repetitve. They have to risk it one way or another. It doesn't even have to be completely different. Maybe new hell beasts like cerberus, or reintroduce more powerful daevas, or whatever. But I've rambled too much.