Mjölnir

Minecraft Java: 26.3 · Type: Datapack · Mods needed: none · Works on servers

Mjölnir adds Thor's hammer to vanilla survival, and makes you earn it. Forge it in a thunderstorm, throw it and watch it fly back to your hand, ride the lightning across the sky and land with a shockwave.

It is a plain datapack with no mods, no client install and no commands needed to play.

Get the hammer

Pick up a Heavy Core or a Mace and a book, The Saga of Mjölnir, lands in your inventory. It walks you through the ritual:

1. Get a Mace. Craft one from a Heavy Core.
2. Get a Nether Star. Defeat the Wither.
3. Place a Lodestone under the open sky.
4. Wait for a thunderstorm, then drop the Mace and the Nether Star on the Lodestone. Lightning forges the hammer.

For testing or admins: /function mjolnir:give_mjolnir

What it does

Ability	How	What happens
Throw	Hold right-click for half a second, then release	The hammer tumbles through the air, hits whatever is in its path and returns to your hand
Fly	Sneak, hold right-click, release	You launch where you look and take no fall damage on landing
Slam	Land from a flight	A mace-style smash hits everything around the landing point
Lightning	Hit something in a thunderstorm	A bolt strikes the target

The hammer is unbreakable. A short chain of advancements follows the saga from the first Mace to the forged hammer.

Balanced for servers

• Cooldowns: throw 4s, lightning 3s, slam 5s. A live bar on the actionbar shows what is recharging, and a soft click plays when it is ready again.
• Weather matters: it is strongest in a thunderstorm. In clear weather cooldowns are 50% longer, there is no lightning and slams hit softer.
• Costs hunger: a throw costs about 1 food point, a flight about 4. You need at least 6 food to fly.
• PvP-friendly: thrown hits and slams are capped lower against players than against mobs.
• Vanilla-friendly: without the resource pack the hammer simply shows as a normal Mace.

Configuration

Every number can be changed in game, and settings survive /reload.

/function mjolnir:config/show
/data modify storage mjolnir:config cd_throw set value 80
/function mjolnir:config/reset

Cooldowns are in ticks (20 = 1 second). Other settings include throw damage, spin speed, thrown hammer size, flight power and slam radius.

Resource pack

The datapack works on its own. Add the optional Mjölnir resource pack for a detailed 3D hammer with a charge-up animation.

Install

1. Download Mjolnir-DP.zip.
2. Put it in saves/<world>/datapacks/, or in the datapacks folder of your server's world.
3. Run /reload or reopen the world.

Compatibility

Made for Minecraft Java 26.3. Other versions are untested.

Who is it for?

Survival servers that want a legendary reward worth a Wither fight, adventure worlds that need a signature weapon, and anyone who has ever wanted to throw a hammer and fly in vanilla Minecraft.

Enjoy the storm!