InvisibilityPotion

Three veil meads for Valheim. Drink one and a fog veil settles over you: enemies notice you less (tier I) or lose you completely (tier II and III), and the strongest mead hides you from other players too. The ingredients grow on plants that nobody can see without veil goggles.

The mod must be installed on the server and on every client (Jötunn refuses mismatched clients). Server and clients also need the same Jötunn version (built against 2.30.0; Jötunn compares its own version down to the patch number).

Screenshots

Install

Mod manager (recommended): install EdgeExploxers-InvisibilityPotion with r2modman or Thunderstore Mod Manager; BepInExPack Valheim and Jötunn are pulled in automatically.

Manual:

1. Install BepInExPack Valheim (unzip into the Valheim folder so BepInEx/ sits next to valheim.exe / valheim.x86_64).
2. Put Jotunn.dll from Jötunn 2.30.0 into BepInEx/plugins/Jotunn/.
3. Put plugins/InvisibilityPotion.dll from this zip into BepInEx/plugins/InvisibilityPotion/.

Result:

Valheim/
└── BepInEx/
    ├── config/saikopsych.InvisibilityPotion.cfg   (created on first start)
    └── plugins/
        ├── Jotunn/Jotunn.dll
        └── InvisibilityPotion/InvisibilityPotion.dll

Dedicated server: same three steps in the server folder (BepInExPack's start_server_bepinex.sh / .bat starts it); the server's config file is the one that counts for all players. Linux users: Steam launch option ./start_game_bepinex.sh %command%.

Use: brew a mead base at the Mead Ketill, ferment it, drink. Find the plants with veil goggles (Forge). BepInEx/LogOutput.log shows Patch health: 25 targets patched, 0 missing when everything loaded.

The meads

Mead	Duration	Enemies	Other players	After a reveal	Carry weight
Faint Veil Mead (I)	60 s	notice you far less (a quarter of the usual visibility and noise), even standing	see you	the veil ends	75 %
Deep Veil Mead (II)	120 s	cannot see or hear you; sleeping monsters stay asleep, raids ignore you	see you	hidden again after 12 s without attacking	60 %
Shadow Veil Mead (III)	180 s	as tier II	no nameplate, no map pin, no real position	hidden again after 8 s	50 %

• Brew the mead base at the Mead Ketill (honey, thistle, bloodbag for II/III, Ymir flesh for III, and 2 of the tier's veil ingredient), then ferment it.
• A chasing enemy gives up after a short while once it loses you.
• You cannot drink a weaker or equal mead while a stronger veil is active.
• The meads and their bases can be set on a table with the Serving Tray ("Mead" tab), like vanilla meads.
• Veil Cooldown: drinking a veil mead starts one shared cooldown (tier I 30 s, II 60 s, III 90 s, counted from drinking) that blocks all three meads until it runs out; it is shorter than the veil itself, so a stronger mead can still replace a running veil once the cooldown has passed. [TierN] Cooldown, 0 = off.

What reveals you

• Dealing damage, taking damage, blocking or parrying, drawing a bow, casting with a staff.
• Tool use: swinging an axe or pickaxe (at anything, even air), building with the hammer, using the hoe or the cultivator. Picking plants by hand does not reveal you.
• A reveal gives the Veil Broken debuff until the veil returns (tier II/III: RehideDelay, tier I: 20 s, restarted on every reveal): stamina regeneration 10 %, eitr regeneration 15 %, health regeneration 35 %, movement 50 % slower (tier I 35 %), and no sprinting. The veil is for sneaking past, not for fighting.
• Breaking your own veil by acting (hitting, drawing a bow, casting, using a tool) also empties your stamina bar (DrainStaminaOnAttackReveal). Taking damage or blocking does not.

Each trigger can be switched off in the config (RevealOnDamage, RevealOnBlock, RevealOnBowDraw, RevealOnToolUse).

Veil plants and goggles

Tier	Plant	Where	Ingredient per pick
I	Huldra's Hair (lichen on the bark)	some Black Forest firs and pines	1-2 Huldra's Hair
II	Baldr's Tear	Mountains	1 Baldr's Tear
III	Hel's Ember Fern	Ashlands	2-4 Hel's Ember Spore

Veil plants are invisible unless you wear veil goggles (helmet slot) of at least their tier:

Goggles	Crafted at	Shows
Watchman's Glass (I)	Forge	Huldra's Hair
Mimir's Glass (II)	Forge level 3, needs Watchman's Glass	tier I and II plants
Allfather's Eye (III)	Black forge level 2, needs Mimir's Glass	every veil plant, and players hidden by a Shadow Veil Mead (nameplate, veiled body, real position; never a map pin)

Picked plants grow back about as fast as vanilla thistle (configurable).

Cultivation

With the Cultivator (costs 1 of the ingredient):

• Huldra's Hair sprout: on the trunk of a fir or pine (aim at the bark).
• Baldr's Tear sprout: on cultivated ground in the Mountains.
• Hel's Ember Fern sprout: on cultivated ground in the Ashlands.

Sprouts are veil plants too: you need goggles to see them grow.

Configuration

BepInEx/config/saikopsych.InvisibilityPotion.cfg. Gameplay values are synced from the server and only admins can change them in game.

Highlights:

• [TierN] Duration, Cooldown, RehideDelay, AggroLossTime, CarryWeightMultiplier, DebuffStaminaRegenMultiplier, DebuffEitrRegenMultiplier, DebuffHealthRegenMultiplier, DebuffSpeedModifier, DebuffDuration, Recipe.
• [General] the reveal switches above, DrainStaminaOnAttackReveal, AllowPvpInvisibility (server switch for tier III hiding from players).
• [Goggles] RecipeT1..3, RevealHiddenPlayers.
• [Plants] lichen chance per tree, zone chances for the ground plants, growth and regrowth times, yields, RetrofitExistingZones / RetrofitReportOnly.
• [Fog.TierN], [Veil] the look of the veil (client side); [Logging] Verbose for the startup dumps.

Console (F5) for admins, the host or a local game: ip_plants [radius] lists the hidden plants, lichen trees and sprouts around you; ip_retrofit shows what the zone retrofit did, ip_retrofit here runs it for your zone. Both also write to BepInEx/LogOutput.log.

With ConfigurationManager installed (F1 by default) you can edit the values in game.

Known limitations

• Wild Baldr's Tear and Hel's Ember Fern appear in newly generated zones and, since 0.4.0, also in zones generated before the mod (RetrofitExistingZones, on by default): the server rolls each zone once a player comes near, with the same seed vanilla would have used, so a zone never fills up over time. A plant can stand close to a location entrance in such a zone. Huldra's Hair on trees works in existing worlds either way.
• The server must run the mod: hiding a player's position from other players happens on the server.
• Mead and goggle recipes are read once at startup from the local config file.
• Veil meads go on the horizontal item stand but not on the wall item stand, and mead bases on neither, like vanilla meads and mead bases.

Support

Source, issues and screenshots: https://github.com/saiko-psych/InvisibilityPotion · If you enjoy the mod: Buy me a coffee

Source and license

MIT. Built with BepInEx and Jötunn.