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Thieving abilities explained

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  • Grond0Grond0 Member Posts: 7,305
    Alonso wrote: »
    @semiticgod and @Grond0: Thank you for your feedback, I've updated my post to reflect your clarifications.
    Grond0 wrote: »
    Beamdog have introduced a further check in the EE in the form you outlined. It's quite possible for your pickpocket attempt to succeed, but for you to be told that the target has no items a thief of your ability can get.
    I guess this is skipped when stealing from stores, right?
    Grond0 wrote: »
    in stores there is no critical failure on a roll of 20
    Are there critical failures when pickpocketing individuals?

    Yes to both.
    AlonsoRAM021
  • AlonsoAlonso Member Posts: 806
    I have updated the title of this thread and the first post to reflect everything we've discussed here. There are still some questions pending:
    1. How long does it take to detect a trap or an illusion from the moment the detect traps/illusions mode is activated?
    2. Stealth and picking pockets are affected by critical failure. Are they also affected by critical success?
    3. What happens when the difficulty of a trap or lock is 100? Is it impossible to detect/disarm/pick it?
    4. What are the values of the environment multipliers for the stealth ability?
  • BubbBubb Member Posts: 998
    edited April 2019
    I can answer the questions via looking at the engine, thought I suspect fellow forumites with greater offhand knowledge can answer faster. I'll just take a stab at this one:
    Alonso wrote: »
    1. How long does it take to detect a trap or an illusion from the moment the detect traps/illusions mode is activated?

    This changes depending on the character. It is rigged to go off at a random point in a round based on the characer's actorID, (which is a completely internal value). If you hit the button at the worst possible time you will be waiting for 99 ticks... or ~6.6 seconds. Hit the button at the best possible time and you will instantaneously detect traps / illusions.

    Edit: So you can say it will take between 0-6.6 seconds for the ability to fire the first time.
    Alonso
  • kjeronkjeron Member Posts: 2,367
    edited April 2019
    Detect/Disarm/Open difficulty of 100 is impossible. Greater or less than 100 is possible.

    Stealth multipliers are x0.5 to x0.67, I cannot get more accurate.

    Set Traps has a critical failure - I'm not sure of the range, but would suspect 5%, and it is affected by luck. On a critical failure the trap is sprung on the character setting it. It actually applies a different spell to the user, suffixed "F", but the Bounty Hunter's Special Snare lacks such a spell, so it won't spring on the user, but it will still fail.

    AFAIK the others do not have critical successes or critical failures.
    loliengorgonzolaStummvonBordwehrAlonso
  • AlonsoAlonso Member Posts: 806
    Thank you, first post updated with the new information.
    kjeron wrote: »
    Stealth multipliers are x0.5 to x0.67, I cannot get more accurate.
    Are there situations in which no stealth multiplier applies (which would be the equivalent of a multiplier with value 1)?
    kjeron wrote: »
    AFAIK the others do not have critical successes or critical failures.
    You mean there is no critical failure when doing stealth or picking pockets?
    Gusinda
  • AlonsoAlonso Member Posts: 806
    What are the highest difficulties for traps and locks?
  • gorgonzolagorgonzola Member Posts: 3,864
    i have no sure data about it as i don't look into the game files, i go by trial and error.
    but i would say that in bg2 there are 2 traps that can not be disabled, a giant trap in the maze under the asylum and a trapped picture in the neb's house. the first always kill you, use an alternative route or send a summon to trigger it, possibly the second one need a very high score, but probably is impossible to disable, has to be tanked (acid damage resistance or high hp).

    this 2 excluded many more competent then me people tells that there is no need to push the open lock and disable trap ability over 100, but i don't know the exact values of the traps and the math beyond the success or failure.
    Alonso
  • OlvynChuruOlvynChuru Member Posts: 3,075
    Here's some information about how thieving skill maximums work.

    For each thieving skill, a character has a base stat, which includes the points spent on level up, as well as bonuses given by opcodes. But each thieving skill also has an adjusted stat, which includes the base stat plus racial and Dexterity bonuses. The base stat can only reach 255, but the adjusted stat can be higher than 255.

    But here's where it gets tricky. When your thief levels up, although spending points increments the base stat, the number shown in the slot on the level-up screen is the adjusted stat. Furthermore, even though the adjusted stat can potentially be higher than 255, the level-up does not let you increase the base stat enough to make the adjusted stat higher than 255. For example, if your character gets +50 to a skill from racial and Dexterity bonuses, leveling up can increase the base stat up to 205 (which would make the adjusted stat 205 + 50 = 255).

    How would you increase the adjusted stat further, then? By using items such as Potions of Master Thievery that increase the base stat. If your character had an adjusted Pick Pockets skill of 205 + 50 = 255, then using two Potions of Master Thievery would increase the stat to 255 + 50 = 305.
    RaduzielgorgonzolaRAM021
  • jmerryjmerry Member Posts: 3,822
    Alonso wrote: »
    kjeron wrote: »
    Stealth multipliers are x0.5 to x0.67, I cannot get more accurate.
    Are there situations in which no stealth multiplier applies (which would be the equivalent of a multiplier with value 1)?
    If you're actually in a shadow or otherwise unlighted area, that's a multiplier of 1. I'm pretty sure daylight is the 0.5 multiplier, and indoor lighted areas are the 0.67.
    OlvynChuru wrote: »
    Furthermore, even though the adjusted stat can potentially be higher than 255, the level-up does not let you increase the base stat enough to make the adjusted stat higher than 255.
    Actually, the level-up caps your adjusted stat at 250. To go beyond that, you'll need to increase the base stat or your Dexterity value.

    There's another way to put more points in a skill than you ordinarily could: lower your Dex while leveling up. The Mustard Jelly form on the Cloak of the Sewers is good for this with a Dex of 9, resulting in penalties of -10 to -20 to most thieving skills. Unlike the item-based solution, the gains from this are permanent.

    But - be careful. There's no check in the level-up process to limit you to 255 base points in the skill. If you have worse than -5 in a skill from the combination of race and Dex, you can keep going past 255 base points. What happens then? It wraps back around; 256 is the same as zero. And no, you don't get a chance to undo and lower your skills back out of that. Once you've wrapped around, those 256 points are forever lost.

    At 9 Dex, the following race/skill combinations can wrap around from greatness to incompetence:
    Human, Half-Orc, Half-Elf, or Dwarf in Move Silently.
    Human, Half-Orc, Half-Elf, Elf, or Halfling in Set Traps.
    gorgonzolaRAM021
  • StromaelStromael Member Posts: 195
    A rule of thumb I use for "being in a shadow or unlit area" is when the infravision red glow kicks in (basically the only use for this ability I have ever come across!). I guess this would correspond to the multiplier of 1? Can anybody confirm?
    AlonsogorgonzolaRAM021
  • AlonsoAlonso Member Posts: 806
    jmerry wrote: »
    If you're actually in a shadow or otherwise unlighted area, that's a multiplier of 1. I'm pretty sure daylight is the 0.5 multiplier, and indoor lighted areas are the 0.67.
    Thanks, I have updated the first post with this info.

    For what it's worth, this mechanic seems so wrong to me. I will gladly accept that a very stealthy individual can become virtually invisible in dark areas. I will even make an effort and believe that the same can happen in indoor lighted areas. But a bloke somehow becoming invisible in the middle of a meadow under the shiny sun of midday? Sorry, but that's too much of a stretch for me...
  • gorgonzolagorgonzola Member Posts: 3,864
    edited May 2019
    the mechanic is surely wrong, not only for the reason you tell about, but, and mainly, because after a thief or stalker is successfully hidden he can move in full light places, stand right in front of an enemy and will continue to be invisible until the next check.
    hide in shadows and move silently are supposed to be thieving skills, not magical things like the invisibility spells, but behave much more like spells then as the ability of a trained thief to move in a sneaky way.

    RP wise it has no sense, but as it can lead to an interesting game play, a player that is skilled in using rogues can use it for multiple purposes, well beyond the occasional stabbing a mage, giving a great tactical value to the game play, i am quite happy that HiS and MS are implemented this way.

    a well used thief can waste whole mage's spell books, appearing at the edge of their sight field and as they begin to target him doing a step backward and hiding, before the on target spell casting is complete.
    he can also appear, having the enemies following him, and hide when he want them to stop, at least in vanilla they stop right next the place he hide, relocating the enemies, or part of them, in the way you want can give to the party an enormous tactical advantage.
    there are many other situations and tactics where HiS and MS can be used very effectively, if combined with stabbing, and 2 corners in a dungeon mean potentially infinite stabbing with no retaliation, or combined with traps, rogue ones and arcane spells that trigger like the traps, what a rogue can do is even much more powerful.

    i could continue, as there is many more then this, like to hide protected by the cloak to have the enemy waste all his true sight, then use improved invisibility and PI without the risk that a single spell kill your buffs and/or clones, to solo a rogue trough a vanilla or hard modded game can teach a lot about how the hiding as implemented in the games is powerful and fun to use, and how the more advanced the tactics a thief uses the more skill is needed by the player as correct timing, of how long hide last and when the next hide is possible, the correct use of the light map of a place and the terrain features, like every obstruction that can put the thief outside the sight of the enemy for the split second that he needs to hide (i know that technically is the opposite, the thief sight is what matters...), the relative speed of thief and who try to chase him need precise planning and a flawless execution to work.

    Grond0RAM021
  • gorgonzolagorgonzola Member Posts: 3,864
    jmerry wrote: »
    But - be careful. There's no check in the level-up process to limit you to 255 base points in the skill. If you have worse than -5 in a skill from the combination of race and Dex, you can keep going past 255 base points. What happens then? It wraps back around; 256 is the same as zero.
    if i am not wrong this risk is also real over buffing with potions, even if in that case it is undone as soon as the potions effect expire.
    to stack too many potions to be sure to steal something up to the point that the skill goes over 255 mean to make your thief not able to steal...
    it is a novice mistake, but can happen so it is useful to tell it here.
  • jmerryjmerry Member Posts: 3,822
    No, the potion effect caps at 255 base points, and you can't overbuff. A quick test:
    Level 1 Halfling Thief with 19 Dex, 40 base points in Pick Pockets.
    PP and OL each have +35 from race and Dex, so they start at scores of 75 and 35 respectively. Now, start drinking potions of Master Thievery. The first five work fully, increasing those scores to 275 and 235. The sixth hits the cap for Pick Pockets, increasing the scores to 290 and 275. The seventh hits the cap for Open Locks, increasing the scores to 290 and 290.
    Said thief can now shoplift from Winthrop with impunity and open all of the locks. Adjusted scores of over 255 work fine.
    gorgonzolasemiticgoddessStummvonBordwehrRAM021
  • gorgonzolagorgonzola Member Posts: 3,864
    i stand corrected :)
    RAM021
  • kjeronkjeron Member Posts: 2,367
    Stealth checks are totally unrealistic - it's based on your line of sight, not whether anyone can see you.
    Blinding yourself is nearly a functional alternative to Hide in Plain Sight - and it's not a bad trade off so long as you re-hide after every attack, as both give a +4/-4 modifier to hit and be hit (in melee at least).
  • AlonsoAlonso Member Posts: 806
    kjeron wrote: »
    Stealth checks are totally unrealistic - it's based on your line of sight, not whether anyone can see you.
    Blinding yourself is nearly a functional alternative to Hide in Plain Sight - and it's not a bad trade off so long as you re-hide after every attack, as both give a +4/-4 modifier to hit and be hit (in melee at least).
    That means the Infinity Engine uses the logic of a toddler: I want to hide from my friend, so I cover my eyes and now he can no longer see me :D
    RAM021
  • gorgonzolagorgonzola Member Posts: 3,864
    as the view range is the same for every creature in the unmodded game probably was easier to check who is in sight of the thief then check for all the enemies in the area if they see the thief.
    this open the exploit of blinding a thief, but as it is clearly an exploit i don't see a problem.

    for me is much more unrealistic that a hidden thief can go in a full light spot right in front of the enemies and is not detected until the next check.
    as is not realistic that if a mage target a thief with a spell that is not fast if the thief disappear because he run outside of the view range of the caster the mage can continue to cast the spell, targeting a person that at the moment he actually pull off the spell is not in sight, but if the thief hides the mage can not complete the cast and loose the spell. if the mage don't see the thief how can he know that the thief has hidden in shadows?

    those are things that make fun and powerful to use a thief but are completely not realistic.
    AlonsoRAM021
  • The user and all related content has been deleted.
    Stromael
  • AlonsoAlonso Member Posts: 806
    kjeron wrote: »
    Set Traps has a critical failure - I'm not sure of the range, but would suspect 5%, and it is affected by luck.
    I'm currently playing ToB with Jan and can't remember any critical failure when setting traps in a really long time, after having set hundreds of traps. I don't think I've used anything that affects his luck. Is it possible that critical failures are cancelled by something, or maybe that they disappear at high levels?
  • kjeronkjeron Member Posts: 2,367
    Alonso wrote: »
    Is it possible that critical failures are cancelled by something, or maybe that they disappear at high levels?
    100+ Set Traps cannot fail, critically or otherwise, no matter your luck.
    semiticgoddessAlonsoGrond0RAM021
  • lroumenlroumen Member Posts: 2,508
    edited June 2019
    Is the reason for that that the bard hla traps should never fail, and as such thieves also inherit that consequently?
    Grond0RAM021
  • ThunderburpThunderburp Member Posts: 51
    The last post is 2 years old but since this thread is linked to as a knowledge resource, might as well add something. I don't know about other game editions or versions, but as of BG1EE 2.6.5.0 and according to their character sheet, a naked, fully rested thief with 0 Luck needs a minimum of 42 to pick a lock with difficulty 50.

    So with 0 Luck, opening a lock should be Skill + 1D8 ≥ Difficulty, rather than the D10 listed in this thread. I didn't check other thief skills.
  • kjeronkjeron Member Posts: 2,367
    edited May 2021
    @Thunderburp
    Open Locks, Bash Doors, and Disarm Trap all have a 1d10 modifier, affected by luck (which allows verifying that it is indeed a 1d10 roll).
    For Success they need: Skill - 1 + 1d10 > Difficulty

    Edit: removed wrong pickpocket information - misread.
    Post edited by kjeron on
  • ThunderburpThunderburp Member Posts: 51
    edited May 2021
    Skill - 1 + 1d10 > Difficulty
    This formula is valid indeed since it fits the minimum of 42 and since, even without extending tests to include Luck, it is possible to fail a difficulty 50 lockpick with 50 points, but not with 51.

    Would you mind updating your post here?


    Edit: Obviously one can make up other formulas that fit those boundaries but Luck allows to prune the wrong ones and you did those tests. I'm all for peer review but in this case I'm on the don't reinvent the wheel team =)

    For the record, the lower bound of the formula coupled with lock difficulty data means there is no need to have more than 87 in BG1 and SoD, and 91 in BG2. There's a 150 difficulty door in Saradush's vampire nest but it can be walked around thanks to a secret passage.
    Post edited by Thunderburp on
    semiticgoddess
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