Gametitle-FNV DM
Gametitle-FNV DM
Stays sharp & will last a lifetime!— Cosmic knife ad

The cosmic knife is a weapon in the Fallout: New Vegas add-on Dead Money.


Made from a "space age" Saturnite alloy in the Big Mountain Research and Development Center, cosmic knives were advertised to be super-sharp, all-purpose kitchen knives that would not chip or dull. A surplus of these knives were shipped to the Sierra Madre Casino kitchens in preparation for the Gala Event. Though lightweight and durable, they proved to be too sharp for their own good, able to cut a person's thumb off if they were careless, as stated by terminals claiming that they were running out of rags to mop up the blood, and even slice through cutting boards with no effort. Concerns were raised about the safety and necessity of having so many of these knives lying about, but Frederick Sinclair insisted that only the best equipment be used.

They were also found to have incredible heat retention, able to stay super-hot for hours after being heated over a stove. However, they are much more brittle when heated, and if left on an uninsulated surface, they would melt right through.

Following the Great War and prior to the events of Dead Money, many of these knives found their way into the hands of the ghost people who stalk the streets of the Villa, who use them as weapons against any unfortunate visitors.


The alloy that makes up the Pre-War kitchen knives is unknown, and seems to have decayed in contact with the toxic cloud.Loading screen

Compared to the regular kitchen knife, the cosmic knife deals more damage and has a longer blade stained red with Cloud residue. It is particularly effective against limbs, where it inflicts a 50% damage bonus. Using Abraxo cleaner, one can turn it into a clean cosmic knife, which deals even more damage. They glow purple before they are cleaned, most likely due to years of cloud exposure. The name "cosmic knife" is a brand name only, referring to the "space-age" Saturnite material it is made of, not because it originates from outer space.

They are used in the crafting of knife spears, throwing knife spears, clean cosmic knives and super-heated cosmic knives. Aside from the handle and tip, they appear similar to the standard knife.

Special attackEdit

It has a special Back Slash attack, which does 70% damage in V.A.T.S. at the cost of 4 fewer action points (requires a Melee skill of 50).

Type of attackIcon attackSkill requiredIcon abilityDamage per attack in V.A.T.S.Icon damageAction point costIcon actionDamage per action pointIcon dap
Back Slash5016.8161.05
Note: Melee weapons do double normal damage in V.A.T.S.

It is possible to execute Back Slash outside of V.A.T.S. (without the required Melee skill of 50 to perform the move) by initiating a power attack (hold attack button) while moving forward.


The cosmic knife can successfully strike about 745 times from full condition before breaking.



Weapon name (current weapon is highlighted)Icon meleeDamage per attack (damage per projectile)Icon damageDamage per secondIcon dpsBonus effectsIcon bonus effectAttacks per secondIcon attackCritical Chance % multiplierIcon chanceCritical damageIcon critical damageAction Point costIcon actionDamage per action pointIcon dapDurability (number of attacks before breaking)Icon repairWeightIcon weightValue in capsIcon merchantValue to weight ratioIcon ratioSkill requiredIcon abilityStrength requiredIcon fist
Cosmic knife fnvdmGametitle-FNV DM12
36x1.5 limb damageIcon damage3x112201.27451353501
Cosmic knife clean fnvdmGametitle-FNV DM15
45x3 limb damageIcon damage3x1.215201.59951505001
Cosmic knife super-heated fnvdmGametitle-FNV DM14
42x1.7 limb damageIcon damage3x514201.47451505001
Note: Melee damage is doubled in V.A.T.S.



  • Despite being developed at Big MT, none can be found there.
  • It was used to cut open hazmat suits that had their locks corroded by the red cloud in the Sierra Madre.

Behind the scenesEdit

Icon cut contentThe following is based on Fallout: New Vegas cut content and has not been confirmed by canon sources.

Shape and texture resources for the cosmic knife, its clean, and super-heated variant are all present in the files of Old World Blues add-on, but not used. Though present, no objects in the add-on use these resources. Curiously the resources are stored within the nvdlc01 folder used by the Dead Money add-on, rather than the nvdlc03 folder allocated to Old World Blues.

Icon cut contentEnd of information based on Fallout: New Vegas cut content.


  • pcIcon pc ps3Icon ps3 xbox360Icon xbox360 The cosmic knife is not affected by the Cowboy or Super Slam! perks. [verified]