Classic World of Warcraft creatures have crossed into Valheim.
What you get
Murlocs on Meadows shorelines, kobold tunnelers in the Black Forest and Redridge gnolls on the Plains. Each uses the real Classic WoW model, skin, animations and voice, read from your own WoW Classic Era install, with Valheim's own AI and combat.
Real Classic trade goods drop from them (Murloc Fin, Large Candle, Gnoll Paw, Linen Cloth) with their WoW names, flavour text and icons. Haldor buys them for coins.
The Elwynn Anvil (Hammer → Crafting), built from Elwynn Forest's anvil model: craft Linen Bandage and Heavy Linen Bandage (heal over time, interrupted by damage, like WoW First Aid) and Murloc Fin Soup.
Llane Beshere, Warrior Trainer waits beside the starting stones. Become a Warrior: Rage builds as you fight and drains out of combat.
Heroic Strike (Alt+1): next melee hit +20 damage
Charge (Alt+2): dash to an enemy 6–20 m ahead and stagger it, out of combat only
Battle Shout (Alt+3): +15% melee damage for 2 minutes
Spell names, ranks and tooltips come from WoW's own data; learn them from the trainer for coins.
Single player.
You need
Valheim, plus World of Warcraft Classic Era installed on this PC (Retail alone isn't enough). Melty installs BepInEx and the mod, and tells the mod where WoW is.
Nothing from WoW is included in the download. The mod reads your installed Classic Era files read-only, and never runs, changes or connects to World of Warcraft or Blizzard's servers.