Valheim Stealth Opportunity

Sneak is the slowest skill to train, and the game never tells you when a spot is worth it. This mod adds a Stealth Opportunity page to the Compendium, listed only when:

• sneaking here trains Sneak at full rate: at least one enemy is within its view range (or 10 m), and none of them is alerted;
• none of those enemies can walk to you: the game's own pathfinding, for each enemy's own navmesh size, finds no complete path. Flying enemies always can.

A rock in a lake, a ledge above a fuling camp, the far side of a wall: the page tells you the spot is safe, and Train Sneaking (F9) does the walking.

While the opportunity lasts, a Stealth Opp. icon (the Sneak skill picture) also sits among your status effects at the top right of the screen, next to Rested or Shelter. It is checked once a second, and it is only a display: nothing is added to your character.

Stealth Opportunity
Enemies in stealth range
  Greyling  14 m  no path to you
Sneak experience rate
  x1     Sneak skill step
  x1     Enemy in stealth range  (x0.1 with no enemy near, or with one alerted)
  x1     Status effects  (none of yours changes Sneak gain)
  x1     World skill gain rate  (world modifier)
  = Gain per second of sneaking : 1
Level 23 to 24: 12.4 / 55.8, about 0:44 of sneaking
Stamina while sneaking
  3.1/s: base 5, skill x0.62, equipment +0%, effects +0%
  A full bar (75) lasts 0:24 of sneaking; no regeneration while you sneak.

How Sneak experience works

Straight from Player.OnSneaking:

• A timer runs only while you move crouched (crouch animation, on the ground, speed above 0.1). Standing still crouched pauses it, it does not reset it. Every second of it is one gain.
• A gain is skill step × range × (1 + status effects) × world rate:
  • range is 1 when an enemy is in stealth range and none in range is alerted, 0.1 otherwise — you do learn a little sneaking alone in your base;
  • status effects are any effect that raises Sneak or all skills;
  • world rate is the world modifier for skill gain.
• A level takes floor(level + 1)^1.5 × 0.5 + 0.5 gains.
• Sneaking costs 5/s × lerp(1, 0.25, √(skill/100)), plus equipment and effect modifiers. Stamina does not regenerate while you sneak, and at zero the game stands you up.

Train Sneaking

Press F9. The character crouches and walks a small circle around the spot, until stamina drops to 8 %, then waits, still crouched (free while standing still), until it is full again, and starts over. Without an enemy in range it still works, at 0.1.

Anything you do stops it: moving, attacking, blocking, jumping, dodging, crouching, running, auto-run, using an item or the hotbar, interacting, sheathing, emotes. Switching windows (Alt-Tab) does not. It also stops on its own if you swim, die, teleport, sit or enter build mode.

Configuration

BepInEx/config/Tchernobill.Valheim_StealthOpportunity.cfg, or in game with Configuration Manager.

Section	Setting	Default	What it does
General	Enabled	true	Show the Compendium page
General	PageTitle	Stealth Opportunity	Name of the page
HUD	ShowStatus	true	Show the Stealth Opp. icon among the status effects
HUD	Label	Stealth Opp.	Text under the icon
Train Sneaking	ToggleKey	F9	Start or stop
Train Sneaking	CircleRadius	1.2	Circle radius, in metres
Train Sneaking	StopAtStamina	0.08	Stop circling at this fraction of max stamina
Train Sneaking	ResumeAtStamina	1	Circle again from this fraction
Colors	TitleColor, TextColor, GoodColor, MutedColor		Page colours
Advanced	LogReport	false	Log the page, or why it is not listed

Multiplayer

Client side only, nothing is stored or sent. Other players do not need the mod.

Check my other mods

	Valheim Voices: English voice bank for Audio Dialogues: 738 spoken lines, eleven voices, from Haldor to the runestones. Synthetic voices.
	Valheim Map Rings: Thin rings on the world map at the distances that matter: where the traders can be, where each biome may start.
	Valheim Parry Sense: A shield under every enemy's health bar tells whether your block and your parry hold against its hardest hit.
	Valheim Paintings: Frame part of your screen, paint it, and hang the picture on your walls with the hammer.
	Valheim Portal View: Every portal takes a picture of what lies through it, and its twin shows that view in its ring.
	Audio Dialogues: Speaks Valheim's dialogues from voice packs out loud.