Why would setting specific rules apply to any other setting? If you want to use them, go for it. You don't get to make that choice for me, though. Those rules as they are written will never make it into my game. First and foremost, centaurs will never be fey in my game.
There are no other player character rules for Centaurs. So, if centaurs as player characters are being discussed, that is what is being discussed.
I'm not sure how to be more clear than that. I don't assume any setting specific changes that make elves immune to Raise Dead, or that Gold Dragonborn explode into energy when they die, so why would we assume that the player character rules have been changed for Centaurs between settings?
When has that ever stopped a DM? If you want a playable centaur in my game, ask. We can work something out.
So... instead of using the rules that exist, you'd want to homebrew rules, then punish the player with the rules you insist on homebrewing?
How does that make anything better for your arguments?
And you will fail each time as those rules do not apply outside of the two campaigns they are printed in.
No.
If I take Changelings and put them into the Forgotten Realms, they do not suddenly become psychic just because Doppelgangers are.
If I take the playable centaur race, and move it into a different setting, the rules associated with that race do not change
unless I homebrew it.
And if you are homebrewing a race to make it harder to play, that is on you, not on me.
It's not a deflection. Without a specific action on the part of the PC for me to adjudicate, I have no idea what would happen.
Right, you can't consider the actions until it is actually happening at the table, and no one can assume any actions you might take based on your previous statements, because that would be putting words in your mouth.
So, we can do nothing except ask you endless questions that you will not answer, because it has to be in the moment, at the table.
In other words, it is a deflection.
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Difficult, not impossible.
You want to play a centaur? Fine. Have at it.
First, give me a DC 15 DEX check to go up the stairs. Fail by more than 5 and you break a tread because you weigh 2,000 lbs. It's not a question of can a horse walk up stairs; it's a question of whether wooden steps can hold a horse's weight.
For comparison, 29 CFR 1910.24(c) states; "Fixed stairways shall be designed and constructed to carry a load of five times the normal live load anticipated but never of less strength than to carry safely a moving concentrated load of 1,000 pounds" [emphasis added]." Therefore, with respect to the design calculation, the normal live load is spread over the whole stair tread area and the moving concentrated load is considered to be a point load applied at a location on the stair system where the maximum stress would be experienced by the system (the 1000 lbs loading criteria is a minimum).
Now, are this inn's stairs up to OSHA code? (fun exercise: read about moving long gun safes into basements - the safe weighs 1,000 lbs and the people weigh another 600 lbs)
Mazel tov! You made it upstairs. Now, give me a DC19 DEX check to come down the stairs. Why? Again, because you weigh 2,000 lbs and are now trying to walk down those wooden stairs with the lower body of a horse. You are trying to put your hooves on 11" treads (at the deepest) and assuming the risers are even. If the treads are shallower, maybe a DC 20. If the risers are uneven, DC 22.
Can a horse walk up stairs? If the stairs are strong enough to hold a horse, sure, with difficulty. Can a horse walk down stairs? Yes. With extensive training. Without extensive training, it's damned hard to do and a misstep will cause injury to the horse and the stairs.
Like I said, the centaur is going to have a bitch of a time.
Centaurs as a playable race weigh between 600 and 840 lbs, not 2,000.
So, easily under 1,000 lbs even in full gear.
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With respect, the discussion is about far more than that.
That set of stats is a starting point in one part of a discussion that has been far more about GMs and their conceptions of their settings than it is about one race printed in one book. Thus the conception of centaurs is at least as important as the published stats. And the conception is probably more based on the traditional view than the recent book about a setting most of your audience probably has little experience with.
The stats, in fact, really seem to be trying to wedge centaurs into a medium size - after calling them medium, they jack up the carrying capacity and state that they "tower over" other humanoids. Basically, while they are technically medium, they are about as large as you can be and still be in that category. They are an edge case. So, maybe leaning away from the technical size is warranted.
This would be, for example, a space for a player/GM discussion. "You wanna play a centaur? Well, okay, but to meet my conception, there may be some terrain that is easy enough for humanoids that I may call difficult terrain for you...."
Sure, but that gets immediately into the problem, doesn't it?
If I'm going to table and asking to play a centaur, I'm looking at playing a 660 lb, medium sized, fey ancestry being. Those are the rules I have.
If the DM is going to say no, because they are picturing a large, 2,000 lb monstrosity then they aren't saying no to my idea, they are saying no to the idea in their head.
And isn't that a problem? If they are operating under a completely different set of rules, and a completely different set of ideas that I as a player have no way to know, then how can we have a real conversation? Are they banning Dragonborn because they don't have dragons in their world? Because they don't want to deal with flight at level 1? Dragonborn don't have flight, but maybe the DM's conception of them does, so they ban them for a homebrew they made up. Something I have no way of knowing. And if a DM is homebrewing something, then banning it based on that homebrew.... that feels wrong to me.
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It goes to RP.
Think back to Fellowship of the Ring. The Inn of the Prancing Pony. The bartender had to bend over the bar to see the hobbits. Or your other example - DEX checks for humans to avoid tripping over halfling-appropriate barstools.
Again, think back to the beginning of the movie. Gandalf bumps his head on a ceiling beam. This wasn't even scripted; it was McKellan accidentally bumping his head on the hobbit-sized set. Why keep it? Why have that flub? Because it established the size difference.
Would I have a halfling roll for every interaction in a goliath bar? Probably not. But there may very likely be one to add flavor - to establish that the character is physically out of place. Why would I make a centaur roll dice to traverse stairs? It's difficult terrain for him. He's not simply any other character who has a some bonus abilities. He's a character who is going to likely have difficulty interacting with some parts of the environment. It's one of the aspects of his Equine Build.
Sure, but RP goes both ways.
In Middle-Earth, the Hobbits pretty much never leave their homes, so they don't interact with Men.
But in DnD different races of different sizes interact all the time. There would be marked differences in everything to account for that. Even if it is something as a step stool for the shorter races to reach the counter, the merchant who spends those few coppers is going to rake in gold for being the preferred merchant for those people.
One of the most powerful lessons of the good of capitalism, is that if you care about profit, you don't care about appearance, religion, or much else. Which can (can, not does, can, I'm talking about an ideal) lead to merchants being much more tolerant of others, and willing to make small concessions for big gains.
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Sure, but the discussion would only apply to centaurs in those specific settings. In a discussion about centaurs in general, those rules only serve as a good place to start the discussion. They can't be assumed to be the default in say the Forgotten Realms.
Again, judging a race on your personal homebrew for that race doesn't help anyone.
Banning changelings because they can cast Detect Thoughts at-will is blatantly wrong. Just because Doppelgangers are the closest Changeling analogue in the Forgotten Realms doesn't mean that we are talking about that statblock instead of the changeling rules.
Shifters are not immune to damage from non-silvered weapons. Yes, Lycanthropes in other settings are, but those rules do not apply to Shifters.
Warforged are not immune to damage from non-adamantium weapons. Yes, Golems in other settings are, but those rules do not apply to warforged.
Minotaurs who are player characters did not commit cannibalism in the name of Baphomet the Horned King. Yes, that is the lore in some settings, but the Player Character version doesn't have that lore.
Centaurs are medium when talking about player characters. Yes, the monster in other settings is large, but that does not apply to the Centaur as a player character.
Making these assumptions, then banning, limiting, or punishing the player based on those decisions is blatantly ignoring the rules.