Kos Parasite
Kos Parasite
Dropped by the Orphan of Kos.
Off physical atk Button -
Off blood atk Button -
Off arcane atk Button 30/60
Off fire atk Button -
Off bolt atk Button - Attr. Bonus
QS Bullet Use 2 Strength icon 2 Skill icon 2 Bloodtinge icon 2 Arcane icon 2
Durability icon 600 - - - A/S
Special Att. Attr. Req.
Slow poison ATK Button Rapid poison Button VS Kin Button VS Beasts Button Strength icon 2 Skill icon 2 Bloodtinge icon 2 Arcane icon 2
- - 100 100 - - - 20
Weapon Info
Weapon Type Right Hand Weapons
Transform One handed tentacle, Two handed tentacles
Imprints Radial, Waning, Radial (Normal)

Radial, Triangular, Radial (Uncanny)

Radial, Triangular, Waning (Lost)

Notes Must be used with Milkweed Rune. Otherwise, it will have the Bare Fist moveset.

The Kos Parasite is a Trick Weapon in Bloodborne's The Old Hunters DLC.


In-Game Description

When the carcass of Kos washed up on the coast, its insides were teeming with tiny parasites unlike any found in humans.
This atypical weapon can only be clasped tight and swung, but a Kos Parasite is said to stimulate phantasms inhabiting a lumenwood.



While the weapon appears to be the Hunter's bare fists at first, using it in tandem with the Milkweed reveals its true form, that of many tentacles sprouting from the Hunter's right hand, with more tentacles emerging from the left hand when the weapon is transformed.

The Kos Parasite is a singular weapon for many reasons. The most obvious is that it deals solely Arcane damage. It has also the highest stat requirement in Arcane for Trick Weapons.

When it comes to its attacks, they are all very slow, with very awkward stumbling on part of the player, yet do not be fooled, every attacks deals a lot of damage and stagger.

Additionally, it has multiple strange moves such as whipping a tongue-like tentacle that sprouts from the players head, a spit back step attack, that deals Slow Poison, and a special move that creates multiple bursts of Arcane Blasts, within a certain radius, which deal tremendous damage. At high levels of Arcane, players can often one-shot other players with this move alone, and since it is an area of effect attack, it can kill multiple opponents at once.


  • The Kos Parasite has "hyper armor" in some attacks, including the special Arcane blast.
  • The right hand returns to its original human state upon performing a Visceral Attack.
  • It's entirely possible to use this weapon without the Milkweed rune. However, though the damage output will suffer, it is still viable enough. This may surprise adversaries in PVP as you will deal a considerable amount of damage with your seemingly bare hands.


  • When performing any sort of dodge, the player will move in a flailing manner as if it was a puppet being pulled.
    • This is especially noticeable when rolling forward, where you simply float back into a standing position, which could imply that the stimulated Lumenwood is capable of subtly manipulating fundamental forces such as gravity.
  • The Kos Parasite bears a close resemblance to the "portuguese man o'war".
  • The Lumenwood form shares its appearance with the Matango (mushroom people) by Toho.
  • The Lost and Uncanny version of this weapon removes the prefix "Kos", turning it into the "Lost Parasite" and "Uncanny Parasite". The only other weapon that has this is Simon's Bowblade.
  • The parasite is possibly a type of Phantasms.



Bloodborne DLC

Bloodborne DLC

Move set without Milkweed rune equipped

  • Even without Milkweed rune , Kos Parasite can still deal a lot of damage.
Bloodborne - Kos Parasite (Move Set Showcase)

Bloodborne - Kos Parasite (Move Set Showcase)

Move set with Milkweed rune equipped