[RPG] What combination of spells and items provide you the best odds of being undetectable?

dnd-5emagicoptimizationstealth

If I were attempting to solo infiltrate a fortress by stealth, what spells/items would I bring to give me the best chance of not getting caught? If the fortress had unknown methods of detection, what should I bring to increase my odds of success?

Types of detection may include:

  • Truesight
  • Sound
  • Movement
  • Magic
  • Smell
  • Thoughts
  • Intentions
  • Alignment
  • Any detection provided by official, published artifacts

Looking for RAW, nothing homebrewed.

Best Answer

No, you can't. But you can reduce your risk.

There are no guarantees in anything with 5e, but there are several items/spells that can assist in making it very hard to find you...

but the Dice may not be in your favor.

Spells

  1. Pass Without A Trace (PHB, 264)

    For the duration, each creature you choose within 30 feet of you (including you) has a +10 bonus to Dexterity (Stealth) checks and can't be tracked except by magical means. A creature that receives this bonus leaves behind no tracks or other traces of its passage.

  2. Nondetection (PHB, 263)

    The target can't be targeted by any divination magic or perceived through magical scrying sensors.

  3. Invisibility/Greater Invisibility
  4. Dimension Door (Move very quickly through. If someone detects you, can get out of there and far away very fast - fast enough for them to likely go about their business and assume it was a false positive detection.)
  5. Etherealness (PHB, 238) - Danger on the material plane? Head to the Ethereal.

Items

(there are additional items that emulate some of the spells above I'm not listing)

  1. Amulet of Proof against Detection and Location (DMG, 150) - works like the Nondetection spell.
  2. Boots of Elvenkind (DMG, 155) - Make no sound - ADV on stealth check to move silently.
  3. Cloak of Elvenkind (DMG, 158) - Disadvantage on perception checks to see you, advantage on stealth checks to hide.
  4. Ring of Mindshielding (DMG, 191) - Makes it impossible to know your alignment, if you're lying, or read your thoughts.