Notes: SPNxBookworm and Jasper6509 asked for witches. SPNxBookworm also requester their familiars, so I put them in the chapter too. :)
Witches:
I hate witches. I always have, and I always will. Those evil sons of bitches are disgusting.
DEAN
They're not all evil, Dean. Most just get corrupted by their power. Like politicians.
SAM
I know many politicians who practice witchcraft.
CASTIEL
Liar-liar, trench coat on fire.
DEAN
Dean, that was… really bad.
Anyone can practice witchcraft, but witches have a more concrete knowledge of the stuff, and they can harness more power. They often live near each other in groups, but they don't have to by any stretch; they're just social.
The power of witches can differ from extremely strong and dangerous, to barely even a threat. So, it's hard to say exactly what a witch can do. Different witches can do different things, so it depends on who you're facing. Generally, however, witches can at least cast spells with the use of hexes, rituals, curses, or charms. They can also normally brew potions.
SAM
The only one who I will allow to brew potions is Harry Potter. And even he is iffy.
DEAN
You've never even read those books or seen those movies.
SAM
I could like Harry Potter. You don't know me.
DEAN
Witches have to use objects most of the time to focus their powers. Amulets, special books, candles, hex bags, and various herbs can all be used for the purpose of witchcraft. Sometimes, albeit rarely, a witch can also have a familiar. These are…
SAM
Creepy. The word you are looking for is creepy.
DEAN
Familiars are shapeshifting (from a human to an animal) creatures that find and serve a single witch throughout their life. They must obey their witch, and are not actually strong at all. They can die as easily as a human.
SAM
So can witches, thank God. The easier it is to kill one of those things, the better.
DEAN
I am sure my Father would appreciate the sentiment.
CASTIEL
Was that a lie, too? I can never tell with you anymore. I don't know where you learned to lie, but it's really annoying.
DEAN
I learned from you, Dean…
CASTIEL