The EVP setting has certain rules which must be adhered to, lest the resulting story be declared non-canonical.
- First, and most important: In EVP, the average, mundane person cannot be made forcibly aware that true Magick is a part of the world he lives in. Although vast and powerful magicks exist, they are strictly of the 'behind the scenes' variety. Thus, the EVP setting must appear to be more-or-less totally mundane on the surface.
- Second: The city in which the original EVP stories (Environmental Protection & etc) took place cannot be named. This city's Mayor is a strictly off-stage menace who cannot show up 'on camera'; he delegates all nastiness to his underlings rather than dirtying his hands with direct action .
- Third: No smut. You don't have to keep it G-rated, and even PG-13 is okay, but R might conceivably be enough to get the story declared non-canonical. X and above is right out. If you're unsure, ask the setting's arbiter for a ruling; that's what he's here for.
- Fourth: Violence is acceptable, but there must always be a moral context to it -- no 'gore for the sake of gore'. If someone gets their throat ripped out, it better not be just for the shock value.
- Fifth: There is a 'higher power' which enforces certain edicts within the EVP setting. Any author who'd like to violate one or both of these edicts should ask the setting's arbiter for more information about the aforementioned 'higher power', including how it will respond to any being in the setting which disregards its edicts.
- Mythical creatures cannot reveal themselves to the human populace at large. Individual human beings, yes; a Super Bowl stadium-full of people, no.
- You can't transform non-sentient beings to mythical critters.
In general, the EVP setting can accommodate any mythical creature that either (a) is sufficiently powerful that it can conceal its existence from the mundane world, and/or (b) resides in locale(s) sufficiently obscure or inaccessible that it's reasonable to believe it wouldn't have been discovered. Conversely, EVP does not include those mythical creatures that are either (a) not powerful enough to conceal their existence, and/or (b) sufficiently obtrusive that they just plain would violate the ironclad 'no obvious magic' rule, end of discussion.
Unicorns, dragons, mermaids, leprechauns, elves, and kitsune are either known to exist in the setting, or else are acceptable under the 'powerful enough' or 'obscure/inaccessible home' clauses. Lycanthropes and vampires -- so-called 'recruiting monsters' -- are forbidden, on the grounds that if they did exist, all humanity should logically have converted into their kind(s) several thousand (million?) years ago. Centaurs are forbidden on the grounds of their highly conspicuous size and their lack of magical concealment. If you're not sure about some mythical creature not mentioned here, ask the setting's arbiter for a ruling.