Mergo's Wet Nurse is a Great One Boss in Bloodborne, and one of the three possible Final Bosses.
- Gain 3 Insight for finding the boss and 3 Insight for killing it.
- This boss is not optional
- Unlocks Blood Rock as a purchasable item at Insight Bath Messenger
- 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 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.|
- 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.
- 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.