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    Default The Rules of Hidden Club: I Think I Failed A Spot Check

    This is a move to save a useful article written by the WotC community forum member LordOfWeasels, originally posted 7-26-2010, shortly before the WotC forum is taken down in October 2015. Formatting is per the original in all its glory. LordOfWeasels, whoever you are, thank you.




    The Rules Of Hidden Club: Things you can't see and things you can't find, in D&D.

    Knowing what you can and can't see, and what you can and can't target, and knowing when you get to say "I aim at the invisible guy in that square" versus "I don't know where he is, I'll just guess", is very important in D&D. The purpose of this mini-guide is to clarify the rules for Stealth and invisibility, and how they interact.


    The Premises, AKA The Core Rules That You Need To Know FIRST:

    The First Premise: Everyone knows where everyone else is, at all times, period.

    No, seriously. EVERYONE. EVERYWHERE. ALWAYS. There is no such thing as a combatant whose current position you do not know. Except....

    The Second Premise: There is one and only one exception to The First Premise, and that exception is Hidden.

    The status "Hidden", achievable only through rolling Stealth, is the only exception to this. It is the only way by which anyone can be uncertain about the current position of anyone else.

    If you are not Hidden, EVERYONE KNOWS WHERE YOU ARE, PERIOD. If you are Hidden, anyone you are Hidden from must guess your current location.

    This is going to be repeated a few more times in the text below, because it is the most important thing to remember and it heavily impacts everything else.

    For the record, I capitalise "Hidden" as it is a specific game concept with a specific meaning, even though the book does not. The book really should - Hidden is a real state, a real condition, and it SHOULD be covered as a fully capitalised game term with a glossary entry, not simply be left to be defined in the Stealth Skill entry.

    Now that that's covered, let's cover some basic concepts:


    "Concealment": Partial LOS failure, usually provided by a class feature, terrain feature, or magic item. You are NOT invisible and you CAN be seen. Concealment is enough to MAINTAIN Hidden, but not enough to BECOME hidden.

    "Total Concealment": You are invisible. Nobody can see you, but unless you're also Hidden, they still know where you are. You can *become* Hidden, but you are not inherently Hidden.

    "Invisible": You have Total Concealment. No, seriously, that's all Invisibility means. Nothing less, NOTHING MORE. Invisibility is NOT Hidden.

    "Hidden": The state of being able to conceal your location. If you are Hidden, enemies have to guess your square. If you are not Hidden, they know where you are, at all times.


    To recap: IF YOU ARE NOT "HIDDEN", YOUR ENEMIES KNOW WHERE YOU ARE, PERIOD, whether they can see you or not. If something doesn't SAY you are Hidden, you are not Hidden, period.

    Becoming Hidden

    How do you become Hidden? You roll Stealth at the end of any Move Action or any of your Actions (even Free Actions) during which you move.

    "Move" is defined in the PHB3 glossary as, roughly, to leave one square for any reason to enter another square. You can't roll Stealth after Forced Movement since that's not your action. You CAN roll Stealth after a granted Free Action.

    You must also meet three requirements:
    1) You must not be visible, which means Total Concealment or Superior Cover, at the end of the move.
    2) Your Stealth roll must beat the Passive Perception of anyone you want to be Hidden from
    3) You cannot have HAD Hidden at the start of the action and lost it during the action. Which is to say, you can't BECOME Hidden as part of the same action that loses your Hidden state.

    By the way, any time you become Hidden, record the number you rolled. It's important.


    Q: Once you are Hidden, then what?

    A: Anyone who wants to attack you must guess what square you are in. Note that you became Hidden AT THE END of a Move, and you weren't Hidden until after the end of the move. Everyone knew where you were before you became Hidden, which means they knew where you were AFTER you became Hidden. If you haven't moved out of that square, they technically have to guess your location but, really, they're going to guess "where you where when they lost you". If you don't move AFTER becoming Hidden, you're not going to avoid a lot of attacks.

    Q: If I'm Hidden, I'm Hidden from EVERYONE, right?

    A: No. Technically, Hidden only applies to enemies, so your allies ALWAYS know where you are unless you're specifically hiding from them, too. Also, Hidden only applies to people against whom you meet the requirements. If you only have Total Concealment from one enemy, you CAN become Hidden from that enemy, but you CAN'T become Hidden from his friends.

    Q: So I'm Hidden, that means I'm safe now, right?

    A: No. Now that you are Hidden, you are a member of a very prestigious and selective club: Hidden Club.

    Hidden Club has rules that you must obey, or you will be kicked out.


    The Rules Of Hidden Club: Losing Hidden

    The First Rule Of Hidden Club:

    Stay out of sight. If, at ANY TIME, you lack at least Cover or Concealment from an enemy, you lose Hidden against that enemy. It doesn't matter if this is your turn or his, or if it's in the middle of a move, or because a Wall got broken down. No Cover and No Concealment = EXPELLED FROM HIDDEN CLUB. Oh, and this means REAL cover - the kind of Cover you get against Ranged attacks by hiding behind an ally doesn't count.


    The Second Rule Of Hidden Club:

    Keep quiet. Anything louder than a whisper, or any environmental interaction above the same kind of level, expels you from Hidden Club.


    The Third Rule Of Hidden Club:

    Keep Still. If you don't move more than 2 squares at a time, you have no chance of losing Hidden. If you move more than 2, you have to roll Stealth with a penalty in order to stay a member of Hidden Club - and every time you do, your new number replaces your old number, for better or worse.


    The Fourth Rule Of Hidden Club:

    Don't Attack. If you attack, you are immediately Expelled From Hidden Club, period.


    The Fifth Rule Of Hidden Club:

    Don't let the enemy FIND you. An enemy can spend a Minor Action to roll Perception, and if he beats your Stealth (you DID write it down, right?), you lose Hidden. As well, any enemy who attempts to move into your space automatically finds you, period.


    The Unspeakable Final Rule Of Hidden Club:

    When you do something to lose Hidden, you keep the benefits of being Hidden until the end of that action. So moving out into the open costs you Hidden, but you keep Hidden until the end of the *entire action* - so if your action is Deft Strike, which lets you move *and* attack as part of the same action, you're Hidden during the attack part even though the Move part of it lost you Hidden. Similarly, if you have a power that lets you attack then move, attacking costs you Hidden but you *are* still Hidden during the move, until the full action is over.




    Things you need to ask your DM about because the rules don't address them

    Q: "if a monster is Hidden from Joe but not from me, can I tell Joe what square it's in?"
    A: Yes, but the concept of "squares" is not an in-game thing for the most part, and some GMs think it should be difficult to tell your allies EXACTLY what square an enemy is in. Other simply say "you know where it is, talking is a Free Action, as long as you WANT to tell your allies where the guy is, you can."

    Which GM is yours? I don't know. You need to ask him.


    A: As of the Rules Compendium, there is now an explicit rule for this on page 150: Yes, you CAN point out the exact square of any creature you are aware of, to anyone else.

    This does NOT mean that the creature is no longer Hidden, or that anyone else can perceive it - but as long as they believe you when you tell them what square it's in, they can "guess" the right square automatically.

    So, as long as PCs are sharing information and can take Free Actions, anyone who breaks Hidden can tell everyone else what square to target.

    Q: "if a power says I can roll Stealth to become Hidden, does that remove the normal requirements for Total Concealment/Superior Cover?"
    A: This is unclear. As-written, both sides have arguments. However, the effects of the different rules are such that a bunch of inconsistent things and additional sources of confusion arise if the requirements to become Hidden are bypassed, while leaving the requirements to become Hidden intact makes those powers a little weaker but results in no confusion or inconsistency.

    I personally am convinced that "does not remove the normal requirements because it does not specifically say it removes the normal requirements" is the proper reading, but that's me. Statistically speaking, you probably don't play in my game. So ask your GM.


    As of the Martial Power 2 FAQ, this has been answered: You DO need to meet all the normal requirements to become Hidden, unless the power specifically says that it overrides the normal requirements.

    The bit about you most likely not playing in my game is still true, statistically speaking.


    Now, for some common questions.


    Q: What about guys really far away, with a distraction, etc?
    A: That's a situational penalty to the Perception skill, as per DMG.

    Q: What about guys in the NEXT encounter? Do I know about them? Do they know about me?
    A: No. They don't exist yet. The rules for Stealth and becoming Hidden apply only to creatures in the current Encounter.

    Q: But I'm invisible! My enemies can't see me! They should have to guess where I am!
    A: You may be invisible, but you're not inaudible, unsmellable, undetectable (think Predator), and you're not Hidden. Since you haven't put the work in to become Hidden, THEY KNOW WHERE YOU ARE.

    Q: But I'm invisible AND they're Blind AND they're 30 squares away AND I'm downwind AND there's a giant roaring waterfall next to me! Shouldn't they have NO CLUE where I am?
    A: Not if you're not Hidden. By the way, I'm counting something close to a +30 situational bonus there - take your NO ACTION and ROLL STEALTH at the end of your next move. Sheesh!

    Q: Can I "move 0" and become Hidden?
    A: Yes, if you used a Move Action. Same with standing up - any Move Action, or any action that lets you Move.

    Q: Doesn't all this make Hidden REALLLLLY hard to get and maintain?
    A: Kind of, yes - but that's intentional. Being Hidden isn't just about Combat Advantage, it's about virtual immunity to attack. As long as you're Hidden and can get away from your last known location unfollowed, you are almost completely immune to attacks and anything targeting you is almost certainly going to miss, outright, without a roll.

    This is very, very powerful. And so it's hard to do. If you're just going Hidden to get Combat Advantage, it's actually a lot easier - but you don't get the immunity to attacks that way.



    Anything not clear? Tell me, I'll add it to the post.
    Last edited by Dimers; 2015-10-07 at 06:29 PM.
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    Default Re: The Rules of Hidden Club

    I'm reserving this space for my own re-write. I'd like to tighten things up a bit, then add in points and side issues that I find important.

    Hidden status

    As in the original essay, the term "Hidden" will be capitalized to highlight that it carries a special game meaning and does not denote or connote what normal English usage would.

    "Hidden" is a state that creatures can attain via Stealth skill checks under particular circumstances. Hidden is on a creature-by-creature basis -- it's possible to simultaneously be Hidden from some viewers and not Hidden from others. Creatures against which you are Hidden don't know what square you're in, only the last square you were in before rolling your winning Stealth check. Creatures against which you're not Hidden know where you are, even if you happen to be invisible, silent, odorless and touching no surfaces.

    To become Hidden to a creature, you must beat its Perception check (passive Perception, by default) with a Stealth check. You're allowed to attempt such a Stealth check when all the following are true:
    1. You have total concealment or superior cover against it;
    2. You haven't lost Hidden status during your current action; and
    3. You finish any move action or any action you take that allows you to move.

    #1 notes: Invisibility happens to provide total concealment against most creatures, so it's handy for becoming Hidden, but Hidden and invisible are not the same thing. Outside combat, the DM may say that neither cover nor concealment is necessary to become Hidden to a particular viewer, e.g. when you're sneaking up behind a guard who isn't looking around.

    #3 notes: You need not actually move during the requisite action. For example, each of these would let you roll your Stealth check: a move action to stand from prone, a move action used to move 0 squares, and a standard action attack that lets you choose to move 0 squares. Teleportation is movement. The action must be yours, though it can be granted by another creature when it's not your turn.

    General notes: You don't have to apply your Stealth check against any creature you don't want to, such as yourself and your allies. Powers or traits that allow you to make a Stealth check don't reduce or remove any of the requirements to become Hidden unless they specifically say they do. Creatures with blindsight or truesight can see you despite obscurement or invisibility while you're within the radius of their special sense, so you can only become or remain Hidden to them with a form of cover/concealment that doesn't rely on those. Similarly, creatures with tremorsense can see you despite obscurement, invisibility, and even objects in the way, while you're within their tremorsense radius and touching the same surface or substance they are.

    Once you've rolled a Stealth check to become Hidden, that roll is used to compare against all future Perception checks until your next check, even if other creatures make many Perception checks against you. Any one of the following automatically causes you to lose Hidden status against one or more creatures:
    1. You have no cover and no concealment relative to a given viewer;
    2. You speak louder than a whisper or draw attention to yourself with a noise;
    3. You attack;
    4. An enemy (not just any creature) attempts to enter your space.

    #1 notes: Any amount of cover or concealment is enough to maintain Hidden. Losing Hidden status against one viewer for lack of cover/concealment does not change your Hidden status relative to other viewers. Cover from ranged attacks doesn't suffice for purposes of remaining Hidden.

    #2 notes: "Draw attention with a noise" is not a defined term and must be adjudicated by the DM. Violating this point automatically removes your Hidden status against each creature that can hear you -- probably everything that isn't deafened, which is a defined term.

    #3 notes: If you attack, you lose Hidden status against all creatures.

    #4 notes: You're not Hidden from an enemy attempting to enter your space.

    There are two more ways it's possible to lose Hidden. You can't move more than 2 squares per action without risking loss of Hidden. Any movement of 3+ squares forces a Stealth check at -5, or -10 if you run. You make your check in the endpoint square of the movement, and the same check is simultaneously used to try to become Hidden against any other creatures you want (and qualify for). And a creature can make an active Perception check (as a minor action) to try to sense one Hidden creature. If the roll is high enough to beat your existing Stealth check result, you are no longer Hidden to that viewer.

    If an action caused you to lose Hidden status, you retain the benefits of Hidden until the end of that action. Being Hidden from a viewer gives you these qualities:
    1. You are silent and invisible relative to the viewer;
    2. The viewer doesn't know what square you are in.

    #1 note A: Technically, this makes Hidden status self-sustaining indefinitely, because invisibility gives you total concealment against the viewer. I don't own a rule source that explicitly says this doesn't work, but the example used in the online compendium shows that that's not how it's supposed to be. Setting aside that nonsense ... creatures against whom you have total concealment grant you combat advantage, can't make opportunity attacks against you, and have -5 to hit you with ranged and melee attacks even if they correctly guess what square you're in. Concealment does not penalize burst, blast, wall or zone attacks.
    #1 note B: Being invisible to that creature also means that it can't see you, which means it can't gain combat advantage against you regardless of the source of CA.
    #1 note C: Since you're not invisible to a creature with tremorsense/truesight/blindsight, if you do manage to stay Hidden against one using some other source of cover/concealment, the creature has essentially no additional penalties against you beyond that source. But they still don't know what square you're in, which many DMs will rule to mean that they can't make OAs.

    #2 notes: Rule-savvy enemies would target the last square you were standing when you became Hidden, since that's where you're most likely to be. It's very hard to lose Hidden with an attack, move and regain Hidden with a separate move action (since you can't regain Hidden the same action you lose it) and then move again, all in one combat round. Targeting the last known square is a good tactic. It's also metagaming, because that's the nature of the rules rather than what the flavortext might suggest. What would be fair: either the DM and players all metagame the same way, or the DM and players all pretend the Stealth check didn't happen in the last known square.

    Per page 150 of the Rules Compendium, it's a free action to point out the location of an enemy not Hidden to you. So enemies who are able to take free actions and communicate effectively might help their buddies correctly "guess" the square you're in. This doesn't change your Hidden status or its total concealment benefit.

    The rogue class option Cunning Sneak can help you become Hidden; any time you end movement 3 or more squares away from your start location, you can make your Stealth check against any creature you have concealment or cover from (not including cover only for purposes of ranged attacks). So if you move quickly, you don't need total concealment or superior cover. In addition, you take no Stealth penalty for moving more than 2 squares, and you only take a -5 penalty to Stealth from running. However, Cunning Sneak does not remove the need to reroll Stealth when you move 3 or more squares! So if you get a high roll, you're better off creeping along slowly.

    Even if the total concealment you get from being Hidden doesn't let you maintain your Hidden status, the monk paragon path Ghostwalker does provide a way to indefinitely sustain Hidden. When you're Hidden you have combat advantage against all creatures thanks to total concealment. A Ghostwalker has concealment against any creature granting him or her combat advantage. Therefore, a Ghostwalker has enough concealment to stay Hidden against anything he or she is Hidden from already. Check with your DM before applying this trick; it's rules-legal but might not be right for all games.

    Experienced players suggest there are times when a DM might grant you total concealment or superior cover if you take action to get behind some object, such as by dropping prone behind a low wall or squeezing on the other side of a tree from an archer. This will depend entirely on the DM and the situation.


    Spoiler: stuff to add or work on
    Show
    My personal preference for moves-with-you, minor action to point out location, many powers providing obscurement rather than concealment
    DMs may rule that true/blind/tremor sense ignores ALL concealment
    removed from the board, removed from play
    these rules don't make sense at great distances or with any creatures not involved in the current encounter
    invisible/concealed/etc ITEMS
    powers where the enemy must / mustn't attack you -- "no easy answer"
    bluff checks and chameleon and other powers to override requirements to make the Stealth check
    houserule for final square not being when Hidden occurs
    you don't necessarily know who you're Hidden from ... DM call? standard 4e promotes player knowledge, as with "bloodied"
    Last edited by Dimers; 2016-05-19 at 04:29 PM.
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    Default Re: The Rules of Hidden Club

    Mods, please sticky this. It's an incredibly valuable resource.
    Thank you Ceika for the wonderful Avatar avatar!

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    Default Re: The Rules of Hidden Club

    Quote Originally Posted by Dimers View Post
    I'm reserving this space for my own re-write. I'd like to tighten things up a bit, then add in points and side issues that I find important.
    Dammit Dimers, what did we say on talking about hidden club?

    On a more serious note: very good write-up, I like it.

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    Default Re: The Rules of Hidden Club

    Quote Originally Posted by Lvl 2 Expert View Post
    Dammit Dimers, what did we say on talking about hidden club?
    It's okay as long as we make our Perception check first.
    Quote Originally Posted by Grod_The_Giant View Post
    We should try to make that a thing; I think it might help civility. Hey, GitP, let's try to make this a thing: when you're arguing optimization strategies, RAW-logic, and similar such things that you'd never actually use in a game, tag your post [THEORETICAL] and/or use green text
    Quote Originally Posted by Lvl 2 Expert View Post
    So a ranger is like a Bachelor of Applied Druidology.
    Quote Originally Posted by Kid Jake View Post
    What's the word for 'fear of being eaten by a mounted bear in half-plate' again? Because that's the one I have.

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    Default Re: The Rules of Hidden Club

    Can we please give this thread the subtitle "I Think I Failed A Spot Check"?
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    Default Re: The Rules of Hidden Club: I Think I Failed A Spot Check

    Quote Originally Posted by tcrudisi View Post
    Mods, please sticky this. It's an incredibly valuable resource.
    I agree (obviously). Hidden Club was 50% of my reasons for going to the WotC forum ... and 100% of my 4e reasons. Very valuable to have this kind of reference available.

    Quote Originally Posted by Kurald Galain View Post
    Can we please give this thread the subtitle "I Think I Failed A Spot Check"?
    *waves homebrewed +1 wand of prestidigitation*
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