Nightmare of Mensis is a location in Bloodborne. You arrive here from the Lecture Building 2nd Floor exit.

General Information



Lecture Building Map



NPCs in the area













  • The Brain of Mensis produces a passive effect, causing the player to generate Frenzy. This effect is disabled by breaking line of sight with the lit window. The player's Frenzy will continue to build for a few seconds after breaking line of sight with the lit window.

Nightmare of Mensis Walkthrough

Heading to the Castle

Progressing forward from the entrance of the area, you'll encounter a Loran Silverbeast crouched behind a wall. These are strong but not too tough, and are very vulnerable to fire, but they do have a bolt retaliation that hits a wide area if you stay close for too long. They also spew out two Parasite Larvae upon dying, though this can be countered by killing them with fire or a visceral attack. 

Continue left from the first Silverbeast to find the first lamp of the area, killing a Scurrying Beast as soon as the hill starts to steepen, but before picking up the Frenzied Coldblood(9). You'll find the lamp tucked behind a ruined wall. At the top of the rise the area opens up and splits into two side paths; ahead of you is a large castle. Take note of the windows on the left - if you remain in the open a light will shine from within the castle causing you to build up Frenzy and dealing damage. You can hide behind taller walls to avoid this, and you can use it to your advantage, as enemies caught in the open when you are hidden will take damage from the light as well. 

  • Right leads past some stone-throwing Yetis and to a device that does not function yet - you can lure these Giants down the path a little way to let the frenzy kill them if you're having trouble, but their attacks are slow and well-telegraphed. At the end of the path is the Mergo's Loft: Base lamp and a lift leading up, which is unavailable until later.bbnom_lamp2
  • Left from the main lamp, you will run into three separate Silverbeasts, one standing in the open, one at the start of the bridge leading to the next area, and one patrolling at the end of the bridge. They can be dealt with easily by luring them out where the orange light will start to hit them, then running back to the lamp where you can take out what remains of their health from the relatively safe area behind the wall. Once you defeat them and cross the bridge, you will reach a path leading to the entrance to the castle, which is mercifully out of sight of the frenzy-inducing orange light. Along the path, there will be a total of four Yeti lying in wait. You can find a Frenzied Coldblood(9) just before the first two Yetis hidden in the rocks on the left, while two more stand near the castle's entrance door (though one remains sleeping until you approach). The first can be safely dealt with, but the remaining three are somewhat trickier, as the one on the right that is awake will fling rocks at you as soon as you enter his line of sight. If you try to deal with the one on the left first, you will do so under constant barrage from behind, and it's very easy to get stuck in the rocks while trying to fight and avoid the flying boulders. However you ultimately choose to deal with the threats, head to the door and take a left before entering, where you can find Blood Stone Chunk just out of sight by the castle wall.bbnom_doors 
    • A slightly easier method is to simply run to the right first, where you can draw the two Yetis back behind a large rock hill and deal with them without being attacked by the third, but this requires you to fight two at once.
    • Alternatively you can use a Blue Elixir to make yourself harder to see and sprint past the whole area. This keeps you well out of the way of the frenzy build up and the Silverbeasts won't react to you until you're literally running past them, so you can get out of the way quickly. 

Finding the Host of the Nightmare

Moving into the castle, you will spot a room full of Nightmare Apostles. Before dealing with that room, take an immediate right onto a short staircase, then head into the opening on the right which leads to a small balcony, and more importantly, the Bell Ringer for the area. Kill her to prevent her from spawning invaders, and pick up the Kin Coldblood(10). Exit the balcony and take a right again, where you will spot a lone Nightmare Apostle hanging from the ceiling. Knock it down with a pebble and kill it, then walk slowly along the small bridge to the left, where you will find another two hanging from above, so back up and fight them in the safe corridor. 


Now, to deal with the Nightmare Apostles. Once the ones in the main room start falling, they all drop in together to fight, and are capable of high damage quick attacks and can easily overwhelm you before you can even get a chance to fight. Complicating things even further is the Large Nightmare Apostle in the center of the room, whose attacks have a tremendous range. Fortunately, however, it can't get through either of the two doors leading out of the room, and if you head back the way you came, the normal ones might get stuck trying to follow you as well. Once the small ones are dead, carefully deal with the bigger bug and continue to the far end of the room, where you will find 6 Shaman Bone Blades on a body. 


Head right out of the room and across a bridge, but be careful - there's a hunter (Choir Intelligencer Edgar) waiting to fight. He uses a Ludwig's Holy Blade and a Rosmarinus, but he has relatively low health and should go down easy. He is easily parried so bait his attacks and do massive damage. In the next room, head to the left before going down to find a chest containing 2x Yellow Backbones. You'll see curious little armoured enemies wandering around, down the stairs; these are Mergo's Attendants which unlike almost every enemy you've faced in this game, are largely ambivalent towards you. If you get close enough they'll aggro but largely they'll just wander on their own paths. Don't take this to mean that they're easy though, they normally come in small groups of two or three and it is quite easy to get staggered by them. 

Once you've fought the Attendants -or maneuvered around them-, look to the right side of the room, where you should spot a Frenzied Coldblood(9) and a green light at the far end of a corridor. Go down that way and activate the lift shortcut leading to bring you back to the lamp if you took the right route before the bridge, and activating the previously inaccessible lift. If you'd like to change your spawn point and/or spend some of those blood echoes, then breathe a well-earned sigh of relief and head back up. 

Back in the room you encountered Mergo's Attendants for the first time, take the big opening straight ahead of the stairs. Take an immediate right to find a Beast Blood Pellet guarded by a few of Mergo's Attendants behind a screen, then go back the other way. There are several more Attendants blocking your path. Deal with them and continue on to a big flight of stairs, but before heading down them, 2x Blue Elixirs wait at the end of a long, curved path to the left of them. At the bottom of the steps, you'll find a Mergo's Chief Attendant wielding a chain and axe, and what's more, her attacks deal rapid poison damage. Her move set is quite similar to that of the Executioner (or the Butchers from Dark Souls). Stay clear of the huge axe, dodge the chain and make sure to time your parries just right. Once she is down, carefully move forward and grab the Madman's Knowledge on the body to the left, behind a cage. 


There are huge pits just beyond the Chief Attendant, so watch your step as you cross through the room. There are a few of the little Attendants in this area, and to the right there are a few that wield crowsbows that inflict rapid poison damage, including one around a wooden screen, attempting to ambush you. It seems as though they are guarding the second Chief Attendant of this area. Fight them one at a time, being mindful of the pits, and continue on to another lift - but before using it, head to the left of it to grab a pair of Lead Elixirs

Up the lift, you'll emerge into an open area outside the castle. To the right you'll spot some truly bizarre enemies - crows with the heads of dogs, and dogs with the heads crows; when fighting them it's best to remember that the head determines the attack, while the body determines the movement. So deal with them swiftly and walk up the stairs to the right. Go right as soon as you reach the top to see a hanging cage containing an item and another dog-headed crow. Sprint-fall onto it (don't jump) and quickly kill this freak of nature to nab a Tampering Damp Blood Gem(5), then return to the stairs and keep going. Head forward, watching out for a pair of hybrids waiting to drop on you from above, and you'll see another pair of levers and an open cage with a button on the bottom. Before proceeding, head left and down the stairs to face a couple crow-headed doggos for a Blood Stone Chunk and a Kin Coldblood (10). Hop inside the buttoned cage, and drop down below to activate another shortcut to the 2nd lamp from earlier. 


Coming back from the shortcut, you'll see a doorway to your left, take it. Go across the bridge and you'll meet another new enemy, the Skeleton Puppet. These guys are ridiculously fast, but they spend most of their efforts dodging your attacks rather than launching their own, though they can still flank you very easily and catch you off guard. The corridor to your left only leads back to the start of the bridge, so steel your nerves and get ready to go through the door and face your worst nightmares...


BOSS FIGHT: Micolash, Host of the Nightmare

After the tedious fight with all the chasing and countless Skeleton Puppets, go through the area and pick up some of the items you may have missed - you'll want to make sure you find the Iron Door Key, at the very least, but you can also find some Quicksilver Bullets, 4x Blood Stone Chunks (1 off of a body, 3 more off of a Scurrying Beast), 4x Blood Vials, another Kin Coldblood(10), and 3x Sedatives throughout this labyrinth. Head out of the top of the maze (where you found the hole to drop down and finish Micolash off) and you'll see that the bridge has now been lifted and you can head over the Mergo's Loft Middle lamp.

It's highly advisable that you equip as much frenzy resistance as you can, if you haven't already, because it's time to face the source of that orange light once and for all. The Deep Sea rune and the Graveguard Set (both available in Forbidden Woods) are invaluable here. Once you're ready, head straight from the lamp and into the next part of the level. 

Finding the Blood Rock

Go up the stairs to the left and immediately turn to your right to find 2x Blood Stone Chunks guarded by two dog-headed crows and a crow-headed dog. Keep going up the long staircase and take another right, where you'll see a familiar green glow - another shortcut.


Ride the cage elevator down to activate it, but keep an eye on the wall as you descend - you should notice an opening. Roll into it (don't go too early, or you'll splatter yourself on the ground below) and you'll find yourself in a secret passage. Head along it, and continue past the doorway to your left to find a chest with an Inflicted Organ in it. Return to the doorway and go through it. Here, you'll have to fight a Winter Lantern on a long bridge. Remember, these annoying enemies cause Frenzy buildup quickly as soon you are in their line of sight, so watch its movement pattern and use the rocks on the bridge for cover. If you can sneak up behind it and get a charge attack in you can do a lot of damage without building up any Frenzy. Once you've killed it, carry on to the middle of the bridge and make sure to look to your right as you near the building at the end to spot a Kin Coldblood (11). 

Keep moving, and you'll find a pair of Winter Lanterns waiting for you. Don't try and take both on at once, instead, pull the one that is patrolling back to the middle section of the bridge, avoiding her grab attack all the way. You can use the structure in the middle of the bridge to break the line of sight if you happen to build up too much frenzy. Once she is down, sneak up on the stationary one and kill her as you did the first one. Once they're both down, pick up the Tampering Damp Blood Gem(5) next to the second, then head into the building at the end of the bridge. There are four spiders in here. These are different to the Nightmare Apostles that you encountered earlier in the level, in that they have an AOE attack they can use if you don't kill them quickly enough, and they have human heads. Kill the four spiders then head out out of the far end of the room and down the stairs. You'll spot a lever at the end of the next room, run across and activate it. You'll be treated to a cutscene showing the Brain Of Mensis being dropped into a bottomless pit.


Once that's over, drop into the hole behind you (to the right facing away from the lever) and kill the two spiders. You can carefully cross the beams and kill the Winter Lantern across you if you want; you'll find a Choir Bell in the chest it is guarding. Whether you go for it or not, leave the building through the exit behind you, where it's now safe to cross the bridge. Head across and enjoy the trail of loot -you'll find 4x Great One's Wisdom, a Madman's Knowledge, an Arcane Damp Blood Gem(5), and a Damp Bloodtinge Gem(5). Once you've got it all, return to where the giant brain was and carefully drop down onto the stone path around the bottomless pit. On a body at the other side, you'll find the only Blood Rock in the main game (outside of the Chalice Dungeons), an item which allows you to bring a weapon from +9 to +10. Opposite the body you'll find a small hole in the wall which will take you back to the bridge where you fought the hunter, way back at the start of the level. From there, you can find your way back to the shortcut back to the Mergo's Loft: Base lamp and return to where you fought Micolash to continue on. 

Getting The Final Moon Rune 

Now that you've dealt with the Brain Of Mensis, you can get the final Moon rune. If you got the Blood Rock you'll be in the right place, in the area where you first encountered the Mergo's Attendants. Head down to the area where you encounter the first Mergo's Chief Attendant and you'll see that there is a new cage lift there. Kill the enemies, or sprint around them and get in the cage which will lower you into the darkness. 

When the cage reaches the bottom, you'll be in pitch black (not unlike when you visit The Abyss in Dark Souls). Get out of the lift, equip your torch and go forward, eventually the Brain Of Mensis will come into view. Don't worry, it can't hurt you now. Approach its largest eye and use the Make Contact gesture. Hold it for about 30 seconds/1 minute and you'll eventually be granted the Final Moon rune. Killing the brain is not difficult as it does not fight back, but it does have a large amount of health. Killing it will reward you with Living String, a ritual material necessary for the Great Pthumeru Ithyll Chalice Ritual, but leaving will not have any punishments. 

Path to Mergo's Wet Nurse 

From the Mergo's Loft: Middle lamp, head back to where you jumped down to get the Blood Rock, but instead of going right and pulling the lever to the shortcut, take a left. You'll spot two Shadow Of Yharnam enemies. One with a katana and one with the candle and sword. They're not as strong as their boss counterparts you encountered in Forbidden Woods so fight them as you would any other enemy. Once they're gone, continue up the stairs, being careful of the third Shadow waiting to throw fireballs at you from above. Past the third shadow, the path splits into three. The narrow path to the left leads to a body with a pair of Blood Stone Chunks on it, the lower path leads to a dead end, and the path up the stairs takes you where you want to go next.


There's a Maneater Boar waiting there with its back facing you, but don't get cocky - there are an other two walking towards you just down the road, so make haste of this one. Rather than facing the latter two at the same time, head down the street until they start walking, then turn around and hide near where you fought the first one. They should separate, allowing you to lure them out one at a time. Once both are taken care of, grab the Nourishing Damp Blood Gem(4), and the 2x Kin Coldblood(11) to the left of the road. 

Further down the road, you'll spot another set of Shadows - four this time. Try to pull the three sword-wielding Shadows away from the one shooting fireballs, or you'll quickly find yourself overwhelmed. Once they've been taken care of, go to the left, down a flight of stairs, and engage two more Shadows. Defeat them, and you'll find the Chime Maiden for the second part of Nightmare of Mensis. Kill her and claim the 2x Blood Stone Chunks off a body nearby, but don't head back to the main path just yet. In this balcony area, you should find another set of stairs leading down into a flooded passage. Follow it, and you'll find a Scurrying Beast holding 3x Blood Stone Chunks (along with a spectacular view of the full moon). 


NOTE: The Boars' charge attack deals massive damage to all characters in its path, and can be used strategically to dispatch other enemies. In other words, if you bypass the main road with the Boars by dropping down where the path branches, and take the waterway to the Bell Maiden, then you can flank the last group of Shadows (mentioned in the next paragraph). At this point, sneak back to the main road and agro the Boars, but do NOT let them catch you--RUN as soon as they notice you, no later than they squeal to signal their charge. They will bowl through the group of Shadows killing some and heavily damaging others, while the Shadows actually retaliate and kill the Boars with their powerful Chikage combos. 

Return to the main road now, and go up the stairs you passed to get to the Chime Maiden. At the top you'll find a sobbing woman in white: Yharnam, Pthumerian Queen. You can't do much with her now, so head down the stairs to her left (directly opposite where you came up) to find a chest holding Iosefka's Blood Vial. In the doorway nearby you'll find one last lift, this one giving you a shortcut from Mergo's Loft: Middle, and if you've been activating all of them as you've gone through Nightmare of Mensis, you'll now have a chain of lifts all the way from the lamp at the very bottom of the castle. Once you're ready, head through the big door, enter the lift, and get ready to fight the final boss of Nightmare of Mensis.



BOSS FIGHT: Mergo's Wet Nurse


Nightmare of Mensis Maps


Translated and modified by EDFscout:


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    • Anonymous

      24 Feb 2021 17:04  

      Man, that italic comment about the boars is the best free blood echo farming in the game. Spawn at Mid-tower lamp, run up stairs, past 3x Shadows, past 3x boars, hook a sharp left as soon as you see 4x shadows. The boars and shadows will massacre each other, leaving you 1-2 half-dead jerks to mop up, and ~20-30k echoes. Rinse and repeat.

      • Anonymous

        05 Dec 2020 00:49  

        The boars can be lured into the moat (line up their charge with the ledge and dodge) where they will work their way around to their original spot, fighting all the enemies in their path. The lower set of Shadows will kill the first pig, while the second pig will fight and kill most of the set of 4. Easiest way to clear this spot.

        • Anonymous

          14 Oct 2020 14:56  

          If ur having trouble read the guide were the bell maidens are first make a b line to them and cut the pvp out :) and wen u die thay wont respawn and you can enjoy the lvl without interuption

          • 14 Jun 2020 06:37  

            There are a lot of DISHONOURABLE invaders in this area. Back in Dark Souls 2, we Dragon Covenant folks used to flex on each other with pure honour and testosterone. Then there's this place. Where's the HONOUR in letting The Brain of Mensis fight for you?

            • Anonymous

              15 Apr 2020 22:14  

              Been playing this game for about a week now really enjoying it until that room with the spiders I had to turn the game off is this the only time they show up or have you got to fight a lot of them? Because if you do I can't see myself finishing it

              • Anonymous

                13 Apr 2020 15:37  

                Well, I think I have a new favourite thing to do in Bloodborne. Wait by the first lamp ringing the sinister bell, then running up and tossing numbing mists on unsuspecting hosts as they cross the frenzy paths.

                • 24 Mar 2020 12:13  

                  The whole first stretch from the lamp to the first shortcut is such a pain, I usually sprint past everything, unlock the shortcut, then double back. Classic Soulsborne design - the enemies are waiting for you to come in the entrance, so if you're back-tracking you catch them all by surprise - especially Edgar.

                  • Anonymous

                    02 Dec 2019 14:28  

                    "Sneak up on the winter lanterns." Lmao. Blue elixir is a godsend for sneaking up on enemies, but even that's completely useless against them.

                    • Anonymous

                      18 Nov 2019 19:17  

                      Huh, Margo's Attendants really do just walk around peacefully. I find that the attendants only aggro one at a time, and if you back off about one meter, they go back to their wandering. Sometimes they'll even bump into the hunter, walk several paces, turn around and stare for a sec. Bizarre little fellas. I wonder if insight or armor affects their behavior.

                      • Anonymous

                        11 Nov 2019 18:26  

                        Probably one of the best farming areas in game. With all three moon runes equipped, I was able to get around 50k blood echoes in the middle loft alone

                        • Anonymous

                          25 Sep 2019 23:21  

                          So, not amazing at this game, but one trick I figured out for the spider room was to do the steps said at first (pebble the lone and lure the two from the bridge), but then to slowly pebble each spider and kill them one at a time. It's slow, yes, but it doesn't draw the others if you do it from the bridge. Helped me avoid the spiders without them chasing me

                          • Anonymous

                            01 Jul 2019 20:46  

                            I've seen a few people saying they have trouble rolling into the window from the cage elevator, as someone who's got a platinum trophy using no quides, and beaten the game 5 times, I gotta say, that window jump kills me 100% of the time if I try to do it going downwards, i always gotta wait and ride the elevator back up to jump into it haha. anyone saying that window jump isnt hard and they're just bad at the game, nah, we just bad at this single jump.

                            • Anonymous

                              30 Jan 2019 16:41  

                              To the people telling other complainers to "git good" with that stupid childish phrase... i just beat those three Winter Lanterns, they do have 360 vision. I WALKED up behind the third one slowly, it STILL TURNED! Not that it matters, they barely phase my character...

                              • Anonymous

                                11 Dec 2018 23:03  

                                Maybe if it was those *****ing knock-off spiders from the Rom fight.. Sure.... Cool... I'm game. But that's not the case.... THAT'S A FULL BLOWN SPIDER. Whoever came up with that spider at FS can drink bleach. ***** them, my arachniphobia is literally skyrocketing

                                • Anonymous

                                  15 Nov 2018 03:57  

                                  its not that bad, i beat it just now on my 4th play through. I will admit the frenzy***** needs to be toned down its unfair even with all the resistances.

                                  • Anonymous

                                    15 Jun 2018 19:32  

                                    I don’t see why people have such a hard time with this place, it’s not difficult just tedious. Farron Keep in ds3 was worse imo

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