What about a mythology pack? but instead of just a mythology career or occultism, you can study at the university. everything in the research is real. Vampires (already included with the vampire pack)
Mermaids (included with Island Life)
Werewolves
witches/warlocks (I know spell caster kinda touches on it)
Psychics
Gods/Goddesses
Aliens (included with strangeville)
Mutants
Plant people (already in-game with the supernatural pack I believe not quite sure)
Fairies
Pixies
Dragons
Halflings (Due to having a baby with a normal sim)
Demons
Angels
Sea Monsters
anything from cryptozoology
A new world is a town that's pretty big not only with some vacant lots but add a new type of lot. Private school or school in general.
There's an optional storyline that has you investigate the goings-on and strange activity.
and with the new strange creatures that you have to do more research on to help or harm. there are cursed/ blessed items you can obtain or create.
with it comes new careers like a monster hunter (Of course there's the branches of that) or headmaster, guardian/protector.
You can be labled crazy by others if you tell them without proof or convince people that what they saw was fake with facts or a nicely told fake fact lies.
you can find old books that can help take you to another realm, cast spells without being a spellcaster, or learn things you don't yet know.
there can be dark and light magic. Dark magic demanding some blood or specific things only hunting the supernatural creaures can provide or light magic that calls for things that you can simply befriend/tame them and you can ask for them.
Of course more herbs and crops will be added and more traits.
Sim creator allows you to pic the creature you wanna be and youll have to learn to hide from hunters and figure out who to trust with your secret and possibly turn loved ones.