Great Swamp Cuculus

Great Swamp Cuculus
General Info
Health Souls Location Drops
2000 n/a Smouldering Lake n/a

Great Swamp Cuculus is a summonable NPC in Dark Souls 3.

Great Swamp Cuculus Information

"Great Swamp Cuculus is a summon for the 'Old Demon King' Bossfight"



  • You can find Great Swamp Cuculus' summon sign at Smouldering Lake, just before the Old Demon King boss gate.
  • Cuculus can be summoned to help for the Demon Ruins if the player does not enter the boss room.


Combat Information

  • Attacks with a whip and with Pyromancies.
  • She will cast Poison Mist and Great Chaos Fire Orb (the latter needs confirmation).
  • Strong against fire damage.


  • It is thought that Cuculus is Corynx's pyromancy master or apprentice, which would explain why after summoning Cuculus a body appears at Corynx's cage where he is found in the undead settlement.
  • This is reinforced by the fact that they are both Pyromancers of the Great Swamp, which makes a mentor connection even more possible.
  • Cuculus is a latin name for cuckoos, a type of bird that lays their eggs in other birds nests to raise their young.



|  Alva, Seeker of the Spurned  | |  Anri of Astora  | |  Archdeacon McDonnell  | |  Black Hand Gotthard  | |  Blacksmith Andre  | |  Company Captain Yorshka  | |  Cornyx of the Great Swamp  | |  Corvian Settler  | |  Creighton the Wanderer  | |  Daughter of Crystal Kriemhild  | |  Daughter of Crystal Kriemhild  | |  Emma  | |  Eygon of Carim  | |  Filianore  | |  Fire Keeper  | |  Giant of the Undead Settlement  | |  Greirat of the Undead Settlement  | |  Hawkwood  | |  Holy Knight Hodrick  | |  Horace the Hushed  | |  Irina of Carim  | |  Jailer  | |  Judicator Argo  | |  Karla  | |  Knight Slayer Tsorig  | |  Lapp  | |  Leonhard  | |  Lion Knight Albert  | |  Livid Pyromancer Dunnel  | |  Locust Preacher  | |  Londor Pale Shade  | |  Longfinger Kirk  | |  Lords of Cinder  | |  Ludleth of Courland  | |  Moaning Knight  | |  Old Wolf of Farron  | |  Orbeck of Vinheim  | |  Painting Woman  | |  Pickle Pee, Pump-a-Rum Crow  | |  Pilgrim from Londor  | |  Ringed City Hollow  | |  Rosaria, Mother of Rebirth  | |  Seeker of the Spurned  | |  Shira  | |  Shrine Handmaid  | |  Silver Knight Ledo  | |  Sir Vilhelm  | |  Sirris of the Sunless Realms  | |  Slave Knight Gael  | |  Snuggly  | |  Stone-humped Hag  | |  Sword Master  | |  The Painter  | |  Unbreakable Patches  | |  Velka the Goddess of Sin  | |  Yellowfinger Heysel  | |  Yoel of Londor  | |  Yuria of Londor  |


    • Anonymous

      19 Jun 2019 18:32  

      Wow some say this is ez but not if you are using a pyro build lt will beat the crap out of ya...dps ahhh good thing toxic mist deals heaven and watch this guy take tons of dmg

      • Anonymous

        12 Jun 2019 23:08  

        Cuculus is cuckoo in Latin and Corno is cuck in Portuguese. This hints that either Cuculus children were nurtured by stepfather Cornyx or his wife/husband cheated on him with Cuculus.

        • Anonymous

          30 Apr 2019 09:07  

          freak hell.... I entered the boss and obliterated the hell out of that newby wihtout calling this phantom... any way I can get those items still???

          • Anonymous

            20 Jan 2019 04:40  

            The easiest way to get her to survive is to go full magic build with 60 int, use Great heavy soul arrow and spam it from near the door way, he dies pretty quickly since he's a demon and she never runs in to die like the tardlord she is.

            • Anonymous

              19 Jan 2019 10:45  

              I chuckle every time I see this guy, I half hope her name is genuinely pronounced "Cuck-you-lus". I'm sure it isn't, though, and that bothers me; does anyone know how it's meant to be pronounced? Has a dev or a writer ever mentioned them in an interview before? If I can't ruin the illusion, the Age of Immaturity shall be perpetuated... By my hands.

              • Anonymous

                28 Dec 2018 03:42  

                Full disclosure, I was 98% certain that this was Wikipedia graffiti...interesting news, I’ve literally never heard of her.

                • Anonymous

                  16 Sep 2018 16:34  

                  I may just be lucky, but I didn't have trouble keeping her alive. In fact, she made the fight significantly easier. In the first few tries, I died because I was way too aggressive, trying to draw the agro off of the cucc. I also had Tsorig for extra damage and to draw agro. Cucc wasn't super stupid, though; she stepped out of the way of AoE attacks and healed when they were low. Usually, one poison gas cloud was enough to poison the demon. Around the 3rd or 4th try, though, we managed to push the demon so that he was stuck in a corner, facing the wall. We kept hitting him over and over, comboing thousands of damage while he almost never attacked. I thought I died during the final AoE blast because I heard Tsorig die, and I couldn't see my character. Then I realized that the demon was done and both cucc and I were alive.

                  • 13 Aug 2018 15:01  

                    Sounds like keeping her alive is a *****. See, this is where a Bonfire Ascetic would've come in handy, but hey, you can always save right next to the fog gate, backup your save and then keep trying until you get things done. That's on PC, I don't know if that can be done on consoles.

                    • Anonymous

                      12 Jan 2018 12:54  

                      i want to do a cosplay of cuculus but cant find her actual equipment set, ik she wears cornyx's set minus the blindfold, spotted whip, normal pyromancy flame and poison mist and great chaos fire ord but i am also certain she uses more pyromancies. Can anyone inform me if she does or not?

                      • Anonymous

                        02 Aug 2017 05:47  

                        Its fun when you do the whole fight, kill the Demon King and then Cuculus dies to that fire ring or the explosion at the very end since she's too much of a stupid cow to heal when she needs it. Good job, you did it. Too bad Cuculus and her dumb ass went and died at the same time with the boss. No set or whip for youuuu...

                        Feel more so bad for Cornyx since he'll have to die for that dumbass wench and her mistakes cause I need my fashion.

                        • Anonymous

                          21 Jul 2017 10:05  

                          Would of been easier to do it without her, I've seen summoned people using only their fists do more damage than her

                          • Anonymous

                            15 May 2017 22:54  

                            If you want Conyx's set, just kill cornyx after you buy all the pyromancies you want from him. You can later save Karla and upgrade your flame from her, as well as buy other pyromancies.

                            • Anonymous

                              15 Oct 2016 10:11  

                              Oh look, yet another idiotic trivia section. Who is the moron who said "DUUHH DEY R BOTH FRUM GREAT SWAMP SO DEY R RELATED DUUUH"
                              No ***** sherlock, ALL MODERN PYROMANCERS ARE FROM THE GREAT SWAMP. *****ing idiot

                              • Anonymous

                                Useless glitch?31 Aug 2016 09:50  

                                I summoned her for the boss, but she was unable to figure out how to use the fog gate throughout the entire fight, dispite me attempting to wait for her before initiating it. In the end I solod him. All she did was run at the fog wall the whole time.

                                • Anonymous

                                  Cuculus Glitch20 May 2016 23:41  

                                  Great Swamp Cuculus has a glitch similar to the Sword Master glitch that can be exploited to defeat Old Demon King easily. When you fight the demon, allow her to die, then save and quit. Resume your game, summon her again and proceed to the boss fight. Cuculus will take zero damage from the demon's attacks. Verified on Xbox ; unsure about other platforms.

                                  • Anonymous

                                    Homeward Bone19 May 2016 10:52  

                                    Just FYI, if Culculus dies during the fight, you can homeward bone out back to a bonfire, resummon her, and then do the fight again. As long as you don't kill the boss with her dead in the fight, you can still get her stuff.But don't forget that you need to banish all other phantoms using the black separation crystal before you can use a homeward bone.Dying should also allow you to summon Cuculus again, so you can just suicide if you think that's easier. I didn't specifically test this however.

                                    • Anonymous

                                      Useless AI02 May 2016 21:19  

                                      be careful during the fight, the ai is so bad in this game they are very likely to die during the fight. and if they do there is no way to get the set until ng+.

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