Cosmic knife

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Gametitle-FNV DM
Gametitle-FNV DM

Stays sharp & will last a lifetime!

— Cosmic knife ad

The cosmic knife is a melee skill 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 wouldn't 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, 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.


Compared to the regular kitchen knife, the cosmic knife is longer, stained red with cloud residue, and does more damage. Using Abraxo cleaner, one can turn it into a clean cosmic knife. 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's made of, and 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 attack

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).

Template:Melee special attack table

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, there aren't any found there.
  • It was used to cut open hazmat suits that had their locks corroded by the red cloud in the Sierra Madre.



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