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)   Mjollnir   War hammer.png
Base item war hammer
Damage vs. small 1d4+1 +1d24
Damage vs. large 1d4 +1d24
To-hit bonus +1d5
Bonus versus not shock resistant
Weapon skill hammer
Size one-handed
When carried


When wielded
  • throwable
When invoked


Base price 4000 zm
Weight 50
Material iron

Mjollnir (colloquially known as Mojo) is an artifact weapon that appears in NetHack. It is neutral-aligned, and its base item is a war hammer.

One possible message for a T-shirt reads "Is that Mjollnir in your pocket or are you just happy to see me?"


A randomly generated war hammer has a 120 chance of being turned into an artifact, which will be Mjollnir or Ogresmasher with equal probability. If one of these artifacts has already been generated, the other will always be chosen. It is the first guaranteed sacrifice gift for Valkyries, and neutral character may receive Mjollnir as a sacrifice gift.

Player monsters on the Astral Plane that generate with a war hammer have a 12 chance of that hammer being turned into a compatible artifact that is not yet generated.[1][2]


Mjollnir has +d5 to hit, and deals d24 extra shock damage against monsters without shock resistance; regardless of resistance, it also has a 15 chance each of destroying wands and rings in the target's inventory.[3] Mjollnir's lightning strikes will also wake nearby monsters.[4]

If you have 25 strength (usually from worn gauntlets of power) and are wielding the non-cursed Mjollnir, you can throw it;[5][6] it can travel up to six squares, roughly half the distance of a normal thrown hammer.[7][8] If you are a Valkyrie, Mjollnir will return to you 99% of the time, and if you are not confused, stunned, blind, hallucinating, or fumbling when it returns, you will catch it 99% of the time.[9][10][11] If you fail to catch a returning Mjollnir, it has an equal chance of falling at your feet or else striking you and possibly destroying wands and rings.[12]


Shock resistance is fairly rare among monster resistances throughout the initial stage of the game, making Mjollnir an excellent weapon for much of the game since it can deal a lot of shock damage. There are few shock-resistant monsters that can be encountered before the Castle: blue dragons are quite rare, storm giants are often not seen until Gehennom, and electric eels can be evaded and killed with other ranged attacks; puddings and gelatinous cubes are not especially dangerous in comparison to these, even with Mjollnir's low base item damage. Energy vortices are the primary danger if you are relying on Mjollnir as your main weapon and lack shock resistance (which the weapon does not provide).

However, though the odds of throwing Mjollnir backfiring are minuscule, the fact that a chance exists at all is enough to put many players off the notion of throwing it - the chance of destroying rings and wands, whether on hostile monsters or in their own inventory, also deters players who seek to preserve loot for similar reasons. As lawful Valkyries have access to Excalibur, they are much more likely to make it their main weapon for the damage bonus against all monsters, on top of the drain resistance and its lack of noise. Despite these drawbacks, Mjollnir is still a very worthwhile artifact weapon for many neutral roles that seek one, especially Tourists and Priests. If you're concerned about Mjollnir backfiring, consider using a stack of daggers as your main thrown weapon against weak or slow-moving monsters, and treat Mjollnir as a backup weapon if the daggers exhaust or you urgently need the extra damage.

From the Castle itself to the depths of Gehennom, shock-resistant arch-liches are one of the biggest obstacles for a player using Mjollnir, and often a huge obstacle in general. Various other monsters such as angelic beings, green slimes, the Riders and hostile aligned priests (including the high priest of Moloch) also resist shock damage - green slimes and angelic beings can occur as summoned nasties, the Sanctum is full of hostile priests, and both angels and priests will be encountered on the Astral Plane alongside the Riders.

Beware throwing Mjollnir at a disenchanter: Mjollnir still has a 110 chance of being disenchanted, and does not produce a message if this happens like hitting a disenchanter in melee combat would.

The following information pertains to an upcoming version (NetHack 3.7.0). If this version is now released, please verify that it is still accurate, then update the page to incorporate this information.

As of this commit, wearing non-metallic gloves (all but gauntlets of power) will protect worn rings from electrical damage; this may provide further incentive to avoid throwing Mjolnir as a Valkyrie.

Average damage calculation

The average damage calculations in the following table do not include bonuses from weapon skills, strength, or from using a blessed weapon against undead or demons.

Weapon Shock resistant Not shock resistant
Small monster Large monster Small monster Large monster
+0 Mjollnir \frac{1+4}{2}+1=\bold{3.5} \frac{1+4}{2}=\bold{2.5} \frac{1+4}{2}+1+\frac{1+24}{2}=\bold{16} \frac{1+4}{2}+\frac{1+24}{2}=\bold{15}
+7 Mjollnir \frac{1+4}{2}+1+7=\bold{10.5} \frac{1+4}{2}+7=\bold{9.5} \frac{1+4}{2}+1+\frac{1+24}{2}+7=\bold{23} \frac{1+4}{2}+\frac{1+24}{2}+7=\bold{22}


Mjollnir first appears in NetHack 3.0.3. In NetHack 3.0.0, an artifact lucern hammer named Thunderfist was introduced, with Mjollnir replacing it in 3.0.3 likely because the lucern hammer was a polearm mistaken for a "standard" hammer weapon.

Mjollnir's throwing requirements and special behavior for Valkyries are introduced in NetHack 3.1.0.


Mjölnir (from Old Norse Mjǫllnir) is the hammer of the thunder god Thor in Norse mythology, used both as a devastating weapon and as a divine instrument to provide blessings. Thor and his hammer appear depicted on a variety of objects from archaeological record, including the runic Kvinneby amulet from the 11th century, and in numerous sources including the Poetic Edda and the Prose Edda of the the 13th century. One book of the Prose Edda, Gylfaginning, describes the god Thor and his "three special possessions", including Mjölnir and a pair of iron gloves called Járngreipr that he must wear with his hammer; this is likely the basis for the strength requirement to throw the artifact weapon in NetHack, which can only be typically achieved via gauntlets of power.



In SLASH'EM, Mjollnir's base item is a heavy hammer, which is made of inherently erosion-proof metal and has slightly higher base damage (1d6 against both small and large foes); this change originated in NetHack Plus. In addition, changes to artifact weapon bonuses make Mjollnir far more formidable with flat +5 to-hit and +24 damage bonuses; artifact weapons can also be twoweaponed in the off-hand, making Mjollnir a very powerful artifact overall and an especially enticing off-hand candidate. It still remains somewhat weak against shock-resistant monsters, however, and its base item is only slightly stronger than a normal war hammer. As its base item is not randomly generated, Mjollnir can only be obtained through sacrifice, wishing, or bones.

Gauntlets of power also behave differently, setting strength to 18/** when worn and augmenting it further based on enchantment, which makes obtaining 25 strength to throw Mjollnir using these gloves generally more difficult. Thankfully, Valkyries can safely enchant gauntlets of power to +7.

Average damage calculation

The damage calculation below assumes a player with Expert skill in hammer, which gives a +2 damage bonus. A blessed weapon deals 1d4 extra damage against demons and undead. The worst case scenario is against a shock resistant, non-undead, non-demon monster. The best case scenario is against a non-shock resistant, undead/demon monster.

Weapon Against regular non-shock resistant monsters Worst case scenario Best case scenario
Uncursed Mjollnir + 0 \frac{1+6}{2}+24+2=\bold{29.5} \frac{1+6}{2}+2=\bold{5.5} \frac{1+6}{2}+24+2=\bold{29.5}
Blessed Mjollnir +7 \frac{1+6}{2}+7+24+2=\bold{36.5} \frac{1+6}{2}+7+2=\bold{12.5} \frac{1+6}{2}+7+24+2+\frac{1+4}{2}=\bold{39}


In xNetHack, war hammers are made into a two-handed weapon that deals 2d6 damage to small creatures and 2d8 to large creatures; this indirectly makes Mjollnir more powerful as an artifact, but also incompatible for twoweaponing or use with a shield.


In SpliceHack and SpliceHack-Rewrite, Mjollnir can be invoked to fire a thunderbolt similar to the wand of lightning.


In EvilHack, Mjollnir provides shock resistance when wielded, and its base item is changed to a heavy war hammer, which deals d8+1 to small monsters and d10 to large monsters.

Priests of all alignments that are crowned will receive Mjollnir as their crowning gift, which is done in a manner similar to Excalibur: if you are a Priest wielding a heavy war hammer and Mjollnir has not yet been generated at the time of crowning, the hammer will be transformed into Mjollnir.

Mjollnir can be forged with Cleaver to create Tempest, an artifact halberd that retains Mjollnir's shock resistance and lightning attack.


In SlashTHEM, all heavy war hammers including Mjollnir are two-handed, so it can no longer be twoweaponed or wielded with a shield; heavy war hammers are also much stronger as a base item, dealing 2d8 damage to small monsters and 2d10 to large ones. This decreases Mjollnir's utility for some neutral playstyles that rely on twoweapon or access to the shield slot (e.g. for a shield of reflection), but the artifact is still a powerful source of damage.

Encyclopedia entry

Forged by the dwarves Eitri and Brokk, in response to Loki's challenge, Mjollnir is an indestructible war hammer. It has two magical properties: when thrown it always returned to Thor's hand; and it could be made to shrink in size until it could fit inside Thor's shirt. Its only flaw is that it has a short handle. The other gods judged Mjollnir the winner of the contest because, of all the treasures created, it alone had the power to protect them from the giants. As the legends surrounding Mjollnir grew, it began to take on the quality of "vigja", or consecration. Thor used it to consecrate births, weddings, and even to raise his goats from the dead. In the Norse mythologies Mjollnir is considered to represent Thor's governance over the entire cycle of life - fertility, birth, destruction, and resurrection.