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Message: <blockquote data-quote="Dr_Rictus" data-source="post: 1762595" data-attributes="member: 850">In the case in question, I would distinguish between the rules of how the game works and the properties of things in the world.   The DM should let the players know what all the rules are of how the game works, but he can keep the properties of things in his world to himself, leaving them for players to figure out.The problem with this is when you have highly experienced players, who therefore have a pre-established notion of how certain in-world things work.  They're actually at an unfair disadvantage compared to relative newbies when you change things without telling them, because they don't know what they don't know.  They should at least be warned that in your campaign, certain monsters will seem to be the ones they know from their Monster Manuals and such, but that you've changed things in certain ways of your own.  If it's an across-the-board change in how a subsystem of creature properties (such as DR) works, I'd say the DM should at least say "I'm changing how DR works, and you'll have to figure out what attacks work on different creatures much as a novice party would."  And in the case of DR, individual players with access to that subsystem (e.g. through spells and such) obviously need to know.</blockquote>