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If a player wants to do something a little out of the ordinary such as punching down a wall with his bare fists, what should I do? Do I make a DC for it? Do I make it so that no matter how much he rolls, he won't destroy the wall? Should I simply tell him that it won't work?

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Punching through a wall should be quite possible for the fantasy heroes that 4e revolves around, particularly after Heroic Tier. There should be rules for breaking things with attacks somewhere, I believe. Not that your question isn't good, just your example. –  KRyan Dec 5 '12 at 5:05
    
A little out of the ordinary =/= impossible. –  Matthew Najmon Oct 6 '13 at 19:48
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up vote 26 down vote accepted

For things that are physically impossible, don't bother with dice. As DM, dice are for when the group needs to determine whether something happens that's probable but neither impossible nor guaranteed. For impossible things, you're allowed to just say so:

Player: I fly to the moon!

DM: …You can't. You don't have wings, a ship, a Instant Moon Travel power, or anything like that.

Player: Can't I just roll against a really high DC?

DM: No.

Perfectly acceptable.

When there isn't a rule allowing something to happen, it's the DM's prerogative to judge whether something is possible, and how difficult it is. Things that are very easy like "I walk up the stairs" don't need rolls for you to say "OK" to — neither do impossible things need rolls for you to say "No" to.

Nota bene, for truly "out of the ordinary" but not impossible things there is Difficulty Class and Damage by Level (DMG, p. 42), which gives you a framework for assigning DCs to tasks that aren't otherwise covered by another rule in the game. Punching down a wall with bare fists shouldn't ever need a DC, but punching down a wall while accidentally turned into a golem might call for a high DC, and that's where to find it.

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Yep, that sums it up better than what I was typing. +1 –  Jonas Dec 4 '12 at 21:06
    
Thanks for the answer and the page reference im looking It up now :) –  Luke Burgin Dec 4 '12 at 21:24
    
Breaking anything, wall or otherwise, should NEVER be DC-based. It is damage-based. Can you do enough damage to overcome its hardness with your fists? If not, just tell the person they whack at the wall for a while and have nothing to show for it but bloody fists. If they can beat the hardness, then they can take out the wall. Eventually. When you deal 1d4+7 to something with hardness 10, you deal, on average, one damage per 4 hits. Breaking a wall with a few hundred hit points will take a while. –  Matthew Najmon Oct 6 '13 at 19:38
    
As for the beating your hands will take, your hands also take quite a beating when attacking other things, like punching someone in the face. In the real world, a BIG part of bare-hand combat training is learning how to not bring back a broken, bloodied hand when you punch a person. An early stage of such training often consists of a lot of punching the surface of water. It's surprising how sore your hands can get from repeatedly impacting water. All of this is abstracted out by D&D. If that's too much abstraction, have hardness reflect damage reduced back on the weapon (his hands). –  Matthew Najmon Oct 6 '13 at 19:46
    
@MatthewNajmon Punching down a wall was just a throwaway example in the question to illustrate what the asker considered impossible. What the question is really getting at is how to handle impossible actions in general. Getting mired in the details of wall-punching would not have answered that underlying problem. –  SevenSidedDie Oct 6 '13 at 19:58
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In my group we have a rule and it's 'always let them make the roll'. It's simple. They try to knock down the wall. Set a DC, becuase that's how the universe works. Just give them a DC they can't make. No matter how high they roll you know they can't succeed becuase given the rules of the universe they don't have ability to do it. After the player rolls a few times and you tell them they're not making any progress, they know it's impossible.

While it sounds railroady, and kind of is, what it actually does is set that the universe you are playing in exists within a set of rules and some of those rules (In the case of the wall, those of basic physics) are not mobile.

That's just the way I run things.

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Why is this rule good, why should anyone else introduce it? "Just the way I run things" is not considered constructive here unless it helps the questioner somehow. –  Pavel Dec 8 '12 at 14:19
    
@Pavel I think the answer contains that: it is good because it establishes that this world runs on a simulationist engine. The rules are basically physics -- anything can be tried, but there's no guarantee the challenge will be within the range of possibility for you. That's something that many players enjoy. –  Jadasc Dec 8 '12 at 15:07
    
I know many players enjoy it. But many players (including me) enjoy it even more if impossible things are discussed metagame, because the player can have some good reason to think they are not impossible. As a GM, I remember few times when I tried to abolish (in fact, set impossible difficulty) actions that were in fact hard, but possible. I don't want to say that your way of explaining in-game physics is bad, I just don't see WHY it should be the best one or at least a good one. –  Pavel Dec 9 '12 at 10:41
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Tell them you think it's impossible; they might have a clever approach that they'll tell you about, or you might disagree about the power of their character. If they persist in their desire, ask them why they want to do it.

If someone wants to do something like punch down a wall or parlay with the clearly non-intelligent ooze or take a well into the dungeon with them, it can be a sign of a larger desire. Maybe they want to try a different character and are trying to kill them off, in which case you can give their character a more noble death. Maybe they're desperately trying to make the game interesting, in which case you can give them more things that appeal to their playstyle.

One thing you shouldn't do is punish them for their attempt. If they're trying to eat glass, sure, they'll take damage. If they punch the wall, the first few times they're going to get hurt knuckles but not shattered bones. No need to assign damage unless that's their goal or the action is dangerous anyway.

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Good points about both finding the why and not punishing them for trying to be creative. –  wax eagle Dec 5 '12 at 13:34
    
+1 for the mental image of "take a well into the dungeon with them" (and for good advice, too). –  Ilmari Karonen Oct 4 '13 at 20:08
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It depends upon the impossibility level, and the nature of your campaign.

For example, punching one's way through the stone wall...

If the campaign is realistic or semi-realistic, just warn them it's impossible, and if they try anyway, instant damage from their punch.

If the campaign is kinda epic, assign an absurdly high DC (like 50+), but allow the optional "reroll at +10 more on a nat 20" and let them abort before rolling.

If your campaign is in silly mode, Just let them succeed on a Nat 20, but the wall slaps them on a nat 1.

In cases where the character is ill equipped, but the action is theoretically plausible, let the player know what they need to succeed. For example, Leaping a mountain. Even in most silly mode games, it's not going to happen. Figure out what they can achieve, and on a really hot crit, let them go a little bit more, but don't violate the cartoon physics any more than you need to.

And, despite the recent raft of GMing advice to the contrary, it is okay to say "No, sorry, doesn't work that way."

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Depending on the wall, it is quite possible to punch through in realistic settings (I'm looking at you, my old apartment). –  Jonas Dec 5 '12 at 2:22
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@Jonas Yep. Drywall & frame walls? Yep. Plaster & lathe? Er, with difficulty and protection, maybe. Stone dungeon walls? Heh, silly players… –  SevenSidedDie Dec 5 '12 at 5:02
    
+1 for it being OK to say "no." –  wax eagle Dec 5 '12 at 13:33
    
Two anecdota. First. During a game, a dwarf decides to bash a locked door with its sturdy head. Becomes wounded and unconscious. Second. IRL I used to strike the walls of my apartment, when very much angered. We installed drywall. And now my corridor wall has two fist-sized holes in it. Needless to say, I no longer do that :D –  Vorac Dec 12 '12 at 10:22
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