Kos Parasite


Imprints (Normal)

radial.png waning.png radial.png

Imprints (Uncanny)


Imprints (Lost)

physical_atk.jpg blood_atk.jpg arcane_atk.jpg fire_atk.jpg bolt_atk.jpg
-- -- 30 -- --
slow_poison.jpg rapid_poison.jpg VS_kin.jpg VS_beasts.jpg durability.jpg
-- -- 100 100 600
Requirements & Scaling
strength.jpg skill.jpg bloodtingue.jpg arcane.jpg qs_bullet_use.jpg
-- -- -- 20

Kos Parasite is a trick weapon in Bloodborne. It was added with The Old Hunters DLC. There are 3 versions of this weapon: Normal, Uncanny and Lost. The only known differences being the Gem Imprints and the locations in which they are found.


Kos Parasite 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"


Kos Parasite Information

  • Transforms from right-hand tentacle to dual-wield tentacles.
  • Requires 16 Blood Stone Shards, 16 Twin Blood Shards, 16 Chunks and 1 Blood Rock ?? Blood Echoes to fully upgrade
  • You must equip the Milkweed Rune to become a Kin and use this weapon effectively, granting a full moveset and a damage multiplier, dealing far more than displayed on the weapon. This will transform the player into a Lumenwood.
  • To perform a Leap Attack, tap forward on the Left Stick as you press R2
  • To perform a Transformation Attack, press L1 while performing another attack.
  • While the weapon is equipped, the player's dash and rolling animations change (due to the Rune)
  • Without the Rune, the character will have the regular unarmed moveset when using this weapon, however the Arcane damage will be added, meaning it can still be effectively used with good enough gems.
  • For unarmed moveset, only right hand has enhanced unarmed damage,




Uncanny Kos Parasite

  • Purchased at Bath Messenger in Isz Chalice (level 3) for 60000 Blood Echoes. (Also confirmed on NG+)
  • If you have the normal version: Create Glyph 8i29rqz3 (Pthumeru Labyrinth) and buy from Bath Messengers up a ladder from the main room for 60,000 Blood Echoes.

Lost Kos Parasite

  • Purchased at Bath Messenger in Isz Chalice (level 3) for 60000 Blood Echoes. (Also confirmed on NG+)
  • If you have the normal version: Create Glyph 8i29rqz3 (Pthumeru Labyrinth) and buy from Bath Messengers up a ladder from the main room for 60,000 Blood Echoes.


Player Notes

  • Its trickmode L2 casts a multi-hitting arcane attack for 2 quicksilver bullets.
  • Backdash R1 in both modes spits a short range projectile forwards that causes slow poison build-up.
  • Jumping attack in transformed mode attacks with your tongue/tentacle.
  • Transform attack back to normal mode fires a short range mass of parasites forward.
  • This weapon will not cause you to recoil backwards after you hit a wall. Coupling this with it's great reach, the Kos Parasite is great for attacking through walls or around obstacles.
  • This weapon has a high amount of stagger with every hit, equal to the Beast Cutter. Since the weapon is slow, it makes up for it with making every human-sized enemy or those slightly larger prone to flinching with every hit (regardless of the type of attack). It's ideal as a bait-and-punish tactic weapon and/or "hit & run".
  • Be wary of this weapon's weaknesses, of which their are many. Neutral lite attacks are altogether cumbersome to get a handle over, being slow with a mediocre, narrow range and large, easily punished recovery periods between them.





- - 30 - - - - 100 100 - - - A 2


- - 33 - - - - 100 100 - - - A 2


- - 36 - - - - 100 100 - - - S 2


- - 39 - - - - 100 100 - - - S 2


- - 42 - - - - 100 100 - - - S 2


- - 45 - - - - 100 100 - - - S 2


- - 48 - - - - 100 100 - - - S 2


- - 51 - - - - 100 100 - - - S 2


- - 54 - - - - 100 100 - - - S 2


- - 57 - - - - 100 100 - - - S 2


- - 60 - - - - 100 100 - - - S 2


Movesets & Videos


Regular Moveset
Move Damage Type & Modifier Stamina Effect
R1 Combo 1.00x, 1.05x, 1.10x 24 Awkward horizontal and slightly diagonal tentacle strikes.
Backstep R1 .75x 28 Regurgitates pale fluid from the head. Causes poison build up.
Dodge R1 1.29x 28 Sweep and thrusting tentacle strike.
Dash R1 1.05x 30 (+run) Thrusts the tentacle forward.
R2 Attack 1.18x 40 Sweeping horizontal swipe, slight uppercut.
Charged R2 1.35x+103 50 Horizontal swipe.
Backstep R2 1.10x210 42 Performs a backhand diagonal slash from the left shoulder to the right foot.
Dash R2 1.18x 45 Performs a forward thrust with a slight sweep.
Leap 1.23x 50 Leaping head butt.
Transform Attack 1.10x 25 (+x) Wide, sweeping attack from both sides.
Transformed Moveset
Move Damage Type & Modifier Stamina Effect
R1 Combo 1.05x, 1.05x, 1.18x 28 Initiates a left tentacle swipe, right tentacle swipe and then a two handed reach out.
Backstep R1 .75x2 28 Regurgitates pale fluid from the head. Causes poison build up.
Dodge R1 .975x 32 After the roll, initiates a dual tentacle forward strike.
Dash R1 1.10x 35 (+run) Dual tentacle forward strike.
R2 Attack 1.25x, 1.45x 55, ?? A dual tentacle thrust forward.
Backstep R2 1.20x 55 Powerful dual tentacle forward thrust.
Dash R2 1.25x+113 60 (+run) Initiates a dual tentacle forward strike with a longer windup.
L2 (90+113+113+350) 100 Initiates a multi hit arcane attack. Consumes 2 quicksilver bullets. Move is the same for every iteration (backstep, dash, etc)
Leap 1.25x 55 Leaping head butt along with a tentacle/tongue strike from the head piece.
Transform Attack 1.00x 25 (+x) Launch a small burst of parasites forward. Short range projectile, costs no bullets.



  • The Kos Parasite is perhaps the most interestingly unique weapon in Bloodborne in various ways: It is one of two weapons that can reach it's full potential while using a rune (the other being Beast Claw), the weapon itself is not held, it is purely an arcane weapon, it is the only weapon directly dropped by defeating a boss, it has the highest durability of any weapon at 600 respectively, it is the only weapon to have an A-scaling of any weapon without any upgrades and is the only weapon to have an S-scaling by upgrading it twice.





    • Anonymous

      08 Oct 2017 19:59  

      This weapon proves that every horrible thing that Brygenwerth and the Healing Church was all worth it in the end. Finally We can be transcend our wretched, toxic meat forms and be reborn as beings of pure, organic produce.

      • Anonymous

        20 Aug 2017 13:19  

        Master Willem:...We are born of the broccoli, made men by the broccoli, undone by broccoli and forced to eat it. Our eyes are yet to open... For god's sake Laurence fear the broccoli man.
        Laurence: Master Willem Are you drunk again?

        • Anonymous

          31 Mar 2017 18:13  

          I think "parasites" that appear when you perform Transform Attack are actually phantasm as we can see in moveset video.

          • Anonymous

            13 Feb 2017 12:59  

            It would appear that the "tentacles" of the Kos Parasite are actually overgrown phantasms. So... magical slugs. Arguably the best weapon for a pure arcane build is slapping people around with giant magic slugs.

            • Anonymous

              22 Jan 2017 22:46  

              Not gonna lie, I kinda think the Kos Parasite in its weapon icon looks strangely reminiscent of Ebrietas... Notice how the strange protrusion on the back of Ebrietas resembles the feather tentacles on the Kos Parasite (as well as on the backs of the Kos-looking slug things in the Nightmare Frontier). That, and the use of tentacles and spitting blood/water is mutually shared.

              Do you think that's why they refer to her as "Daughter of the Cosmos?" Is Ebrietas really just the full-grown version of the parasite, minus the lumenwood? Is that why she weeps at the Altar of Despair, the one thing that can revive the dead? "Together with the left-behind Great One, the Healing Church looks to the stars, in hopes they might rediscover true greatness."

              BABY MISS MAMMA KOS?

              • 31 Dec 2016 14:53  

                AR at 50 arcane.
                +0) 30 +25 /+1) 33 +29 /+2) 36 +34 /+3) 39 +39 /+4) 42 +44 /+5) 45 +49 /+6) 48 +55 /+7) 51 +61 /+8) 54 +67 /+9) 57 +74 /+10) 60 +81.

                • Anonymous

                  no messengers, but patches24 Jul 2016 19:28  

                  So I went to dungeon 8i29rqz3, and instead of there being the bath messengers, patches was there instead. It would seem that once you befriend patches he replaces the bath messengers in dungeons, and his items don't cost anymore than buying it from the dungeon messengers.

                  • Anonymous

                    Right...05 Jul 2016 14:35  

                    So, to effectively use this weapon, you must pray for Kos to grant you eyes, become a blue, tentacled mushroom, and have insane arcane. And try to play the rest of the game with a straight face.

                    • Anonymous

                      Which Variant would be best for an arcane build?05 Jul 2016 14:35  

                      I just got the base parasite but I'm unsure weather its worth it to level or if I should grab the lost or uncanny variant. I'm running pretty much pure arcane and am leaning towards the lost version at the moment.

                      • Anonymous

                        Weapon Variants in Isz05 Jul 2016 14:35  

                        On NG+, cost doesn't change (still 60k); also found variants of weapons expected to be in pthumeru messenger shop (like MHS and Simon's BB)

                        • Anonymous

                          Is it viable?05 Jul 2016 14:35  

                          I'm on ng++ with 45 arcane/45 strength. Is it worth upgrading to +10? I definitely like the moves.

                          • Anonymous

                            Fist Moveset05 Jul 2016 14:35  

                            If you use this weapon without transforming, it uses the normal fist moveset, but with way more damage. This means that using fists are now much more viable as you can now equip bloodgems and fortify the weapon. I'm not sure what it scales with, but I think it is arcane.

                            • Anonymous

                              Glyph for variants?05 Jul 2016 14:35  

                              Do we just have to actually make an Isz root chalice or does someone have a glyph to use?

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