Mergo's Wet Nurse

General Info
hp.jpg blood_echoes.jpg Location Drops
14081 72000 Nightmare of Mensis One Third of Umbilical Cord
physical_DEF.jpg VS_blunt.jpg VS_thrust.jpg --
148 177 148 --
blood_DEF.jpg arcane_DEF.jpg fire_atk.jpg bolt_DEF.jpg
148 75 75 75
slow_poison_RES.jpg rapid_poison_RES.jpg VS_beasts.jpg VS_kin.jpg
250 180 No No

Mergo's Wet Nurse (メルゴーの乳母 Merugō no uba lit. "Mergo's Wet Nurse") is a Great One Boss in Bloodborne, and one of the three possible Final Bosses.

Mergo's Wet Nurse Information






Combat Information

  • When health drops below 70%, Phase 2 initiates, but only becomes more aggressive during Nightmare Veil.
  • Do not fear her flurry attack that uses all blades- it may seem intimidating, but if you can run around to its back, it can only hit you a couple of times from there and you can easily regain that health by attacking. It's also the best time to lay down some heavy damage.
  • At unknown triggers, the nurse will create a purple fog that engulfs the area, and a clone will appear. After about a minute, this fog will dissipate, as will the clone. During the fog, the clone will warp around the arena (typically behind the player) in an attempt to catch the player off-guard. While the original uses a variety of leaping and long-range attacks, where her arms extend to extreme length. During this part of the fight the back of the boss is wide open, and you can deal massive damage.
  • The clone dies in 1 hit, if you are using a fast weapon you can take it out each time and go back to the boss to get in easy damage.
  • When the purple fog is cast, lock onto the original and evade counter-clockwise. She will always teleport to the player's left side, and won't be able to keep up. During subsequent fog episodes both Mergo and the clone will teleport on the players right as they run counter-clockwise. The strategy still works perfectly though with the occasional jump/roll added while moving.
  • It is possible to prevent the purple mist if you can stagger her while she is casting it.
  • Evade toward her left side to avoid many of her attacks. Getting to her back side guarantees safety from most of her attacks.
  • Poison throwing knives are very effective against this boss.
  • Molotovs and Oil Urns can combine for a safe, effective strategy.
  • The Arcane weapon buff Empty Phantasm Shell is effective against this enemy.
  • Using the Tiny Music Box during this fight will cause the Wet Nurse to side step.
  • Most of her attacks (save from the blade flurry) can be rolled under. Pay attention to which way her arms move when she swings them around.
  • She is particularly weak to bolt, a levelled up Tonitrus or a levelled up weapon with Bolt paper will do massive damage to her.
  • She is extremely weak to Rapid Poison as well.


Attack Name Attack Description & Counter
Flying Lunge Dodge forward into the attack or evade to the left or right to avoid this attack.
Long Slashing Attack with all Blades The Wet Nurse slashes viciously with all blades. Evade away from this attack or position yourself behind the boss so that you can attack during this long animation.
Spinning Attack The boss spins from its left to its right. Evade into the boss towards the left side to avoid this very dangerous attack. If this attacks hits you will take massive damage.
Lunge Attack The boss uses all of her blades to to do lunge attack in a straight line in front of her. If you take your distance, the attack won't even hit you most of the time.
Blade Slam The boss slams all blades on the ground in front of her. Has a long windup, and is easy to get hits in if you roll behind her.
Arm Stretch Occurs while the arena is covered in fog. The Wet Nurse stretches her arms forward in an attempt to stab the player. While this attack covers a great distance and can be difficult to see, it's easily avoided by dodging to the side.
Nightmare Veil Blankets the area in darkness, drastically reducing visibility. Keep moving till it wears off.
Phase 2 Attack Description & Counter
Deathly Duo Used only while Nightmare Veil is in effect. Summons a clone that attacks from beside you at regular intervals; Dash counterclockwise along the edge of the arena and don't stop moving until the effect ends.



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Lore Notes

  • Mergo's Wet Nurse bears a striking resemblance to the Amygdala's with its four pairs of long limbed arms, although its head shape is entirely different.
  • The nightmare slain is actually Mergo, or the nightmarish link to Mergo, for whom the wet nurse is only the guardian. The long pause between defeating the boss and the confirmation that the nightmare is in fact slain only happens after the baby's cries fades away and goes silent.
  • Mergō is the first person form of the latin verb mergere which can mean anything from "to submerge", "to overwhelm", "to drown", "to conceal". One may assume that Mergo submerges the player and various NPCs in The Nightmare.
  • Mergo continues to cry during the fight and there is a strange patch of light just past the crib.
  • She is the only Great One that uses weapons and the blades greatly resemble the Burial Blade. According to the Burial Blade's description the blade, the siderite blade "fell from the heavens". It may have been dropped or given by The Wet Nurse.
  • The Wet Nurse does not bleed. Instead, hitting her produces puffs of dust and a strange sound. The same thing happens when hitting ghostlike enemies like Silver Lady, Evil Labyrinth Spirit and Mad Ones. This suggests that The Wet Nurse is a disembodied spirit.
  • She has the same number of limbs as Amygdala and the Mi-Go (plus two wings).
  • When seen from above she forms a star, or pentagram with her top arms, wings and "head".
  • The Wet Nurse has a unique way of stretching her arms to attack. This feature has also been displayed by Manus, Father of the Abyss.
  • She is in fact invisible. Beneath her dress you can detect the movement of legs. The sound of her footsteps make her sound heavy.
  • Her amulet, with its four gems, matches the rune Communion. This is also a symbol of The Moon Presence and The High Priestess.
  • Her limbs and head very awkwardly match the backside of Ebrietas when she is sleeping.
  • The amulet has a strange way of swinging forward. It is inconsistent with the Wet Nurse's movements and it makes it look like the amulet is yanking the Wet Nurse forward.


Notes & Trivia

  • It's possible for the clone to remain after the fog dissipates.
  • She has one of two One Third of the Umbilical Cord's in the game that don't require correct actions to be taken at set times. The other being in the Abandoned Workshop.
  • After Mergo's Wet Nurse dies, the lullaby stops and the baby starts crying. However, using the Tiny Music Box makes the baby laugh before it goes silent.
  • After defeating her you can also go back the direction you entered, and Queen Yharnam, who was previously sobbing, will bow her head in thanks and vanish.
  • Mergo's Wet Nurse, along with Moon Presence, are the only two bosses that give the message "Nightmare Slain" instead of the normal "Prey Slaughtered" (or the Japanese message "You Hunted"). However, it could also be argued that the "Nightmare Slain" message doesn't appear until Mergo's crying stops, implying that the Nightmare was Mergo. The DLC increases this number to three with the Orphan of Kos.
  • The battle is triggered by going near the baby stroller, so it's possible to circle around the whole arena without starting the fight, as long as you stay a certain distance away from the stroller.
  • The fight was bugged and seemingly incomplete in pre-release copies, having only one attack programmed. This is not the case in the proper releases. Restarting console seems to help with that glitch.
  • If you kill Mergo's Wet Nurse while she finishes casting her fog, her dying animation plays but the fog and health bar stay. You have to wait until the fog disappears to see the "Nightmare Slain" screen.



Wet Frontal 2 Thumb.jpg Wet Frontal 3 Thumb.png
Wet Skyward 1 Thumb.jpg Wet Teleport Thumb 2.jpg
Wet Omnislash 1 2 Thumb.jpg Wet Darkness Summon Crop Thumb.png
Wet Frontal Dark 1 Thumb.png Wet Dark 1 Crop Thumb.png
Wet Slasher Thumb 2.png Wet Slasher 2 Thumb.jpg
Wet Clones Dark 1 Thumb.jpg Wet Stretcharms 1 3 Thumb.png
Wet Clones Attack Thumb.jpg Wet Darkness Spider 2 Thumb.jpg
Wet Stretcharms 3 Thumb.jpg Wet Clones Slaughter Thumb 2.png


Wet Amulet Close-up 3 Thumb.jpg Wet Arm & Belly Detail Thumb.png
Wet Sword Detail Thumb.png Wet Tipped Thumb.jpg
Wet Darkness Summon Eyes Thumb.jpg Wet False Eyes Thumb.jpg
Wet Feather Detail Thumb.jpg Wet Luminous Patch 2 Thumb.png
Wet Luminous Patch 1 Thumb.jpg

    • 02 Sep 2017 23:55  

      It's just my impression or this boss fight is designed to be a cakewalk for a ranged build? I fought her as a physical quality build and found out she barely did anything at all while I was at long range. In fact, the fight was a constant getting closer, fishing the attack, dodging it, land some hits and rinse and repeat...the only difficult part, for me, was the dark mist part, actually....can someone whi played ranged build confirm this?

      • Anonymous

        17 Jul 2017 16:53  

        The Wet Nurse looks a lot like the Shadows of Yharnam, who are apparently servants of the Queen, but if that's the case, why do they refuse to give back the Queen's child? I guess that's a pretty common theme in Bloodborne, though. Willem was once Laurence's master, but Laurence rejected his warning; the Vicars are the successors to Laurence's establishment, yet they don't seem to follow his teachings, either. Rulers are constantly being superseded by their subjects, perhaps because their servants envy them and their closeness to Greatness.

        • Anonymous

          12 May 2017 18:23  

          Something weird happened when I fought it, I played the music box a few times, and it side stepped as previously stated. But then it seemed to lock on / focus on something totally apart from me. It just kept nailing the wall, circling and slashing the opposite direction as me. Almost like it thought I was the baby? It's the same melody as Margo's lullaby..... Just really strange. Seemed very non aggressive after that, though it did do the clone. But even then, the clone attacked me while the actual nurse just faced the wall and stood there. I saved the video via PS.

          • Anonymous

            22 Apr 2017 02:07  

            The only reasonable explanation I can come up with for the whole story is that the Moon Presence made the Hunt because it doesn't want humans and Great Ones to merge (maybe the name Mergo was some way of hinting it?).
            Funny enough this would make the Moon Presence almost look like a good entity that just wants the infection to be over.

            • Anonymous

              09 Mar 2017 17:33  

              I found something today not mentioned on this page (might need more testing). When she's casting the nightmare veil, I was able to interrupt it using Madaras Whistle. Worked twice, never had to deal with the dark

              • Anonymous

                03 Mar 2017 17:39  

                Can it actuallly be the Oedon himself? Like, "shapeless Great One" - and this invisible one, one of the final bosses, taking care of Mergo the Nightmare?..

                • Anonymous

                  18 Jan 2017 20:30  

                  nop, its how fast you kill it. The first time for me it took me some time, so i got those clones. In the second time I try I used beast pills and bold paper, I kill it in less than a minute (no shadow clones).

                  • Anonymous

                    22 Dec 2016 07:22  

                    So, Mergo is dead in the waking world, stillborn from Queen Yharnam. However, as seen with Micolash, whose mummified body we find in Advent Plaza, one can be dead in reality but alive in the dream. Being an Old One fetus, however, he still needs to be sustained by a mother, in this case a surrogate, a wet nurse. Now, given that once the wet nurse dies, Mergos cries fade away, we can conclude that the formless wet nurse was the only thing keeping him alive.

                    Divert for a second and consider Yharnam bowing to the Hunter after the fight; Mergo's constant crying suggests he was in pain or otherwise suffering, and the Queen is thanking you for putting him to rest.

                    Finally, let's consider the role of the Moon Presence in all this. We know it instituted the hunt, and that the hunt ends when Mergo is dead. But what stake could it have in euthanizing Mergo? Well, the Great Ones are not unsympathetic to humanity and the School of Mensis is directly responsible for the plague of beasts by summoning the Blood Moon via a crying Great One. So, it may be that having transcended the physical world, the Moon Presence was merely trying to clean up the mess made by The Brain of Mensis.

                    • Anonymous

                      Just Plain Sad16 Sep 2016 08:20  

                      So this is the 2nd final boss? I had a rougher time with the Blood Starved Beast. I haven't defeated Gerhman yet so I don't know what happens after him but I still find Mergo a disappointment.

                      • Anonymous

                        Evading08 Aug 2016 18:56  

                        so I died first hit with the spinny 6 sword thing( not the flurry the uppercut) but after I read this and dodged right it was way too easy.

                        • Anonymous

                          Mergo27 Jul 2016 08:47  

                          literally went in thinking it would be tough dodged a couple all blades and lunges and slashed away with +10 chikage killed her in less than 30 sec, bleed did 40% of her hp. wtf she never even got to phase 2 this boss needs a buff

                          • Anonymous

                            A wet nurse boss05 Jul 2016 14:41  

                            Well valley of Defilement 2.0 with those accursed plague baby as helpers in the boss fight would be fun or annoying

                            • Anonymous

                              poison05 Jul 2016 14:41  

                              It's weak to poison. Put rapid poison gems on your weapon and stock up on poison knives to throw at him. Remember when you phase and there's two of them that you don't need to dps them to get it over with, just focus on surviving, it will end eventually.

                              • Anonymous

                                Her cloning05 Jul 2016 14:41  

                                When i fought her she never cloned for me <br/>all there was were her basic attacks and occasional teleporting.

                                • A meh boss05 Jul 2016 14:41  

                                  I managed to beat her with a tonitrus the first time with only 5 blood vials and no quicksilver bullets, just time your side steps perfectly and stay behind her at all times and spam your weapon and you should be fine.

                                  • Anonymous

                                    the purple part didnt happen for me05 Jul 2016 14:41  

                                    I just fought the boss and she just did her spiny attack the whole entire time, it was extremely easy and pretty boring

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