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


  • 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  ♦  Black Hand Kamui  ♦  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


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    • Anonymous

      04 Feb 2020 09:13  

      As the king's health was completely eradicated, she was hit by his dying fire blast. I seriously wanted that whip and outfit. I bonewarped and wiped at least 20 times because she died earlier, but all that was wasted when she died at the same time as the boss.

      • Anonymous

        26 Oct 2019 18:41  

        So to get a real fashionsouls set you need to make a decently tough boss 1.5 times harder by summoning a phantom that only uses poison AKA does jack to the healthbar. Thanks fromsoft

        • Anonymous

          24 Aug 2019 04:34  

          I thought this was a player and didn't want to bother them with my stupidity. I can't get those items anymore until ng+ can I?

          • 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.

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