Talk:How Stealth and Detection works

How Stealth and Detection works sometimes? Proposal, as very difficult to confirm. Try negative Search to auto fail detecting traps; a snail can detect a lot of traps. I also tried to counter the +5 DC to Detect Mode during Stealth but then when Searching for Traps, I have no other explanation.

Stanley Woo's take on Stealth and Detection is so widespread that it may be considered canon. The Passive 5ft detection is as the Game Manual suggests, but 5ft is also the same distance for Attacks of Opportunity. This is would be very close for detecting traps and short of what can be achieved. In comparison 5 meters in game is half way into a small room or 4 paces.

Trap detection radius: 5m (half tile; line of sight) Trap detection roll: d20 (half skill running) Trap detection check: every 3 seconds Spot or Listen detection roll: d20 (half skill running) Spot or Listen detection check: every 5 seconds
 * Passive Search (walking)

Trap detection radius: 10m (one tile; 8 paces) Trap detection roll: d20 Trap detection check: every 3 seconds Spot or Listen detection roll: d20 Spot or Listen detection check: every 3 seconds
 * Detect Mode (or Keen Senses)

Player detects stealth: every 5 seconds (less in Detect mode) Player rolls d20 for stealth: every 6 seconds NPC detects stealth: every 4 seconds (less in Detect mode) NPC rolls d20 for stealth: every 6 seconds
 * Stealth

Detection clock cycle is not triggered by encounters and detection can occur within the time span, whilst a trap or a hidden creature is within range. So an Assassin who has just Hidden in Plain Sight may have less than five seconds to escape, before his chance of being detected and less if being actively searched.

+10 if Hiding (no movement, this includes cowering or bleed damage) +5 at night +2 Line of Sight blocked + Skill (lowest or average? of Hide and Move Silent) -5 if Torch/Light carried +/- other modifiers + Invisible (super stealth)
 * Stealth Modifiers

+5 Detect Mode or Keen Senses +5 for standing still +5 if Torch/Light/Darkvision used at night + Skill (Search, Spot or Listen) -5 not in facing arc (erratic) -1 for every 3 meters of distance +/- other modifiers Spike Growth spell, (not good for your sneakers) Line of Sight blocked
 * Detection Modifiers

-30    Keen Sense PC immune to AI Sneak Attacks (or Detect Mode toggle master; Spot only) -20    Sneak Attacks unlikely -15    Few Sneak Attacks, brief stealth -10    Occasional Sneak Attacks, short stealth -5    Fair Sneak Attacks, fair stealth 0    Good Sneak Attacks and stealth +5    Reliable Sneak Attacks and Hide indefinitely +10    Hide indefinitely verses Keen Sense +15    Sneak indefinitely +20    Sneak indefinitely verses Keen Sense Listen may not achieve the Sneak Attack immunity with high level skill as with Spot.
 * Stealth odds verses Detection (guide)


 * For a rough estimate to d20 verses d20 odds; 50% +/- 2.5% per DC point difference, or ask and I'll publish a d20vd20 table.


 * Ragimund (talk) 10:19, September 26, 2018 (UTC)