Gammadoodler
Hero
It's certainly true that PCs need enough information about the world to make intelligent choices.But if you mess with people's assumptions, they stop believing the fantasy.
If your PCs are wandering into a village and see a stray dog on the side of the road begging for food, it's reasonable to assume it will behave like a regular dog will. If it says "thank you" or breathes fire at them, people will want to know why their assumptions were wrong. If your response is "its a fantastical setting, you shouldn't assume things are like they are on Earth", your PCs will have no frame of reference for encountering anything. Do all dogs talk? Do all trees explode in poisonous gas when cut?
One of the golden rules of storytelling is that if you change the assumptions of your world, it can't be a surprise to the audience but not the people who live in it. If your world lacks daylight, or has half the gravity of Earth, or such, that is not going to be a surprise to the characters. And in an RPG, your players are part audience and part author. They shouldn't be surprised that humans are capable of flight with practice or things.
Which is what Micah is saying; spell out your changes so that when people know when a common Earth entity differs. Or you risk players assuming they know nothing about your world and cannot make intelligent choices about it..
World mechanics are described for many physical actions in the game.
Game mechanics are provided for PCs which spell out what the PC's capabilities are. Players do not need to worry about how their character may or may not be similar to Earth standards or why. The game tells them what they can expect to be able to do, and in whatever setting those characters are in, the world functions such that their PC can do them (unless the DM says otherwise).
The DM fills in as desired.
The player should expect the world and their characters to behave as the game mechanics describe, because that is how games work.
They should expect the DM to describe the way the world works when it conflicts with the game mechanics or when the mechanics are silent, because that is how D&D works.
Any expectations beyond this should be held only loosely until confirmed by the DM in-game.
After all, in these settings..
Here there be Dragons
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