Valkyrie's Hatchery

AI disclosure: Valkyrie's Hatchery is a vibe-coded project. The idea, the design decisions, and all of the in-game testing came from Drakexi. The code was written by Claude under Drakexi's direction. Every feature was tested in-game before release. If you'd rather avoid AI-written mods, you can make that choice knowingly.

Love fish, hate the fishing minigame? Valkyrie's Hatchery lets you raise fish at home. Build a hatchery in your base, fill it with roe, and come back to fresh fish, earning Fishing skill as you collect them.

Vanilla fishing is untouched. If you enjoy it, keep fishing. The hatchery is just another way to get there.

From the maker of Valkyrie's Vision.

How it works

1. Build a Valkyrie's Hatchery (hammer → Crafting): 20 Wood, 10 Fine Wood, 8 Stone, near a workbench. It looks like a dark-stained hot tub, and it works indoors.
2. Get some Fish Roe. Haldor sells it for 10 coins each. After that, make your own at the food preparation table: any one fish gives 2 roe (more from higher-quality fish).
3. Put the roe in the hatchery. Water fills the tub.
4. Wait. One roe hatches into a fish every 10 minutes. When a fish hatches you'll hear it splash, and the water keeps bubbling while fish are waiting.
5. Collect your fish by opening the hatchery and taking them out. You gain Fishing skill for every fish you collect.

What hatches

Most fish (80%) come from the biome the hatchery is built in. The rest can be any fish from a biome whose boss you've defeated, so your fish selection grows as you progress.

Fish	Home biome	Unlocked elsewhere by	Fishing XP
Perch, Pike	Meadows, Black Forest	Eikthyr	10
Trollfish	Black Forest	The Elder	15
Giant Herring	Swamp	Bonemass	20
Tetra (rare)	Mountains	Moder	25
Grouper	Plains	Yagluth	25
Tuna, Coral Cod	Ocean	The Queen	30
Pufferfish	Mistlands, Ocean	The Queen	35
Anglerfish	Mistlands	The Queen	35
Magmafish	Ashlands	Fader	40
Northern Salmon	Deep North	Kall Fimbulbringer	40

Tetra lives only in frost caves in the wild, so it's rare from the hatchery too, unless you build in the Mountains.

Hatched fish are always quality 1. Trophy-sized fish are still a reward for real fishing.

Good to know

• Only roe goes in. Anything else you put in the hatchery is handed back. Fish only arrive by hatching, so they can't be put back in for extra XP.
• It works while you're away. Leave for a while (or sleep) and the fish that were due are waiting when you return.
• When it's full, it stops. If there's no room for another fish, hatching pauses until you make space, then picks up at its normal pace.
• Whoever takes the fish out gets the XP.

⚠️ Before uninstalling, empty your hatcheries. If the mod is removed, the game deletes any hatcheries left in the world, along with everything inside them. This is how Valheim treats pieces from removed mods.

Installation

Install with r2modman, Thunderstore Mod Manager, or Gale (available on Thunderstore and Hexium). Requires BepInEx and Jötunn.

Multiplayer: the server and every player need the mod. The hatchery and roe are new things in the world, and a game without the mod would delete them. Players without it get a clear message when they try to join. The server's settings apply to everyone and are locked while connected.

Settings

Found in BepInEx/config/com.drakexi.valkyrieshatchery.cfg.

Server-controlled (on a server, its values apply to everyone and are locked):

Setting	Default	Description
Slots	12	Storage slots per hatchery: 4, 6, 8, or 12. Hatcheries resize live; anything in removed slots is moved to a free slot or dropped in front of the hatchery.
HatchMinutes	10	Real minutes for one roe to hatch (0.5 to 120)
XpMultiplier	1	Scales the Fishing XP per fish (2 = double, 0 = none)
HomeBiomeChance	80	Percent of hatches from the hatchery's own biome, when other fish are unlocked
ProgressionSource	World	World (bosses defeated on the world) or Player (the boss kills of the player whose game is running the hatchery)
RoePrice	10	Haldor's price for one roe

Personal (each player chooses):

Setting	Default	Description
ShowXpMessage	true	Show the Fishing XP gained when you collect fish
PlayHatchSound	true	Play the splash sound when a fish hatches

Bugs & feature requests

Report bugs or suggest features on GitHub Issues.