Exactly when do I level up in sneak

the-elder-scrolls-v-skyrim

I'd like to grind my sneak in Skyrim. Exactly how does the game decide when I level up in sneak? What are the precise conditions or logic the game uses in making this determination?

EDIT: I understand that sneaking around and not being noticed will help me level up. I'm looking for exactly what the algorithm the game uses to decide when to give me experience is. For example, how close do I have to be to someone? Do I level up faster if I'm closer? Does being partially noticed help or hurt?

I want to know because right now, leveling up my sneak feels magic. It's always a surprise to me when it happens, and I don't like that. If I could understand why I level up when I do, I think sneaking would be more satisfying.

Best Answer

"[H]ow close do I have to be to someone?"
~45 feet.

"Do I level up faster if I'm closer?"
No, I don't think so.

  • 2.5 base XP for becoming hidden within ~45 feet.
  • 0.625 base XP per second hidden within ~45 feet.

http://www.uesp.net/wiki/Skyrim:Leveling#Skill_XP

"Does being partially noticed help or hurt?"
Help, I guess, because you gain Sneak XP while "being partially noticed", apparently even without having to move at that point, unlike if no one even suspects your presence.

Aside from sneaking while "being partially noticed", there are multiple ways to gain Sneak XP:

  • moving in a sneaking state within earshot of a non-friendly but not being (fully) detected,
  • sneak attacking,
  • getting training from a Sneak trainer,
  • reading certain skill books,
  • certain quest rewards, and
  • the "advSkill" console command
  • (, and also some anomaly at the beginning of the game).

Using a skill grants skill XP according to

Skill Use Mult * (base XP * skill specific multipliers) + Skill Use Offset

Sneak Skill Use Mult = 11.25
Sneak Skill Use Offset = 0
Sneak Skill Improve Mult = 0.5
Sneak Skill Improve Offset = 120
∴ 11.25 * (base XP * skill specific multipliers)

Sneak "Sources of XP/Notes":

  • 2.5 base XP for becoming hidden within ~45 feet.
  • 0.625 base XP per second hidden within ~45 feet.
  • 30 base XP for a melee sneak attack.
  • 2.5 base XP for a ranged sneak attack.
  • Additional multipliers may apply.

http://www.uesp.net/wiki/Skyrim:Leveling#Skill_XP

Range, by my own testing:
Enemy unit: X -396.68, Y 4701.32, Z 471.82
Me within edge of range: X 967.24, Y 4678.92, Z 400.65
Considering how far one unit does not move me, I'd guess that the units are in inches. Considering how flat the ground seems to be and the difference between my z-pos near the enemy (384.5) and at the edge, there seems to be a difference between the enemy model's (Imperial Soldier) z-pos and mine (Imperial female with weapons drawn). Just calculating the X and Y axes, their range of perception is sqrt(1860779.5264) or 1364.10 units. If the units are inches, that's 113.675 feet.

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