Persona 5 / Persona 5 Royal - P5R Maruki Palace Overview and Infiltration Guide


A complete walkthrough and strategy guide for the research lab palace in Persona 5 Royal. This includes a list of characters, obtainable items, equipment, enemies, infiltration guides, and a boss strategy guide for Azazoth and Adam Kadmon.

Persona 5 / Persona 5 Royal - P5R Niijima Palace Overview and Infiltration Guide

Persona 5 Royal Palace Guides
Kamoshida Palace Madarame Palace Kaneshiro Palace
Futaba Palace Okumura Palace Niijima Palace
Shido Palace Depths of Mementos World of Qlipoth
New Palace

Guide for Maruki in Persona 5 Royal

The final Palace (Research Lab Palace) appears unnamed at the start. It resembles a research laboratory. Parts of the Palace also manifest biblical attributes. The Palace consists of many puzzles like switches in the examination rooms, security-locked doors, and color dials. The Protagonist starts off the investigation accompanied by two members of the Phantom Thieves. After a while, the other members will soon join the fray


Here is a list of party members available in the current palace:

Member Persona
Persona 5 / Persona 5 Royal - ProtagonistProtagonist Persona 5 / Persona 5 Royal - Arsene PersonaArsene
Persona 5 / Persona 5 Royal - MorganaMorgana Persona 5 / Persona 5 Royal - Zorro PersonaZorro
Persona 5 / Persona 5 Royal - Ryuji SakamotoRyuji Sakamoto Persona 5 / Persona 5 Royal - Seiten Taisei PersonaSeiten Taisei
Persona 5 / Persona 5 Royal - Ann TakamakiAnn Takamaki Persona 5 / Persona 5 Royal - Hecate PersonaHecate
Persona 5 / Persona 5 Royal - Yusuke KitagawaYusuke Kitagawa Persona 5 / Persona 5 Royal - Kamu Susanoo PersonaKamu Susano-o
Persona 5 / Persona 5 Royal - Makoto NiijimaMakoto Niijima Persona 5 / Persona 5 Royal - Johanna PersonaJohanna
Persona 5 / Persona 5 Royal - Futaba SakuraFutaba Sakura Persona 5 / Persona 5 Royal - Nercronomicon PersonaNecronomicon
Persona 5 / Persona 5 Royal - Haru OkumuraHaru Okumura Persona 5 / Persona 5 Royal - Milady PersonaMilady
Persona 5 / Persona 5 Royal - Goro AkechiGoro Akechi Persona 5 / Persona 5 Royal - Robin Hood PersonaRobin Hood

Obtainable Items

Name Effect
Tin Clasp A fastener made from tinning. (¥2050)
Tanned Leather A highly elastic animal hide. (¥4800)
Silk Yarn A bundle of silk yarn. (¥1150)
Condenser Lens A lens that gathers light. (¥3600)
Iron Sand Iron sand with traces of magnetic properties. (¥3350)
Red Phosphorus A pyrophoric, toxic powder.
Liquid Mercury A shimmering silver liquid metal.
Magnetic Tape*
USB Code*
Empty Voice Recorder*
Detached Meter Panel*
Distorted Convex Lens*
Old Projector*
Small Sound Sensor*

Shadow Enemies

The Research Lab nests the new enemy type called Flaming shadows. These enemies can be tough to pick off due to their lack of weaknesses and trait to repel to Phys and Gun skills. Combine ailments with Technical bonuses to bring them down with ease.

Name Weaknesses Resist Absorb Null
(Treasure Persona)
Bless Phys, Gun
Bugs Fire, Nuke
Biyarky Ice, Nuke Fire, Wind, Curse
Loa Bless Fire, Nuke Elec
Dionysus Elec Bless, Curse
Macabre Bless Elec Curse
Chimera Wind, Curse Fire Ice
Nebiros Bless Phys Psy, Curse
Cu Chulainn Elec Phys, Gun, Wind Bless
Scathach Elec Ice, Curse
Alilat Fire, Curse Phys, Gun Ice Psy
Baal Fire, Bless Wind
Belial Ice Phys, Curse
Hastur Fire Wind Psy, Curse
Surt Ice Fire
Fafnir Elec Fire, Ice Phys, Gun
Siegfried Gun, Ice Phys

Mini-Boss Enemies

Mini-Boss Persona HP Skills Weakness Item Drop
Corrupt Evangelist Belial 550 Eigaon
Wage War
Twisted Abyss Hastur 2200 Magarudyne
Death Scythe*
Vacuum Wave
??? ??? 1250 Sword Dance
Brave Step
??? ??? Sword Dance
Vorpal Blade
Composite Body Biyarky Agidyne
Heat Riser
Ice, Nuke
Loa Psy, Bless
Deformed Lion god Chimera Wind, Curse
Great General Cu Chulainn 2200 Vorpal Blade
Magician Scathach 2500 Myriad Slashes
High Counter
Burning Giant Surt 4200 Taunt
Blazing Hell
Atomic Flare
Evil Dragon Fafnir 2500 Gigantomachia
Cosmic Flare
Nocturnal Flash
Dragon Slayer Siegfried 5000 ??
Vorpal Blade
Wild Thunder

Palace Boss

Boss Level HP SP Skills Weakness Rewards
?? Phase 1 8000 Megidolaon
Devil Smile
Azatoth 6000
Assistant Tentacles 650 Fire, Ice, Elec, Wind
Healing Tentacles 650 Nuke, Bless, Curse
Protective Tentacles 650 Phys
?? Phase 2 3000
Adam Kadmon Vital Strike
Attack Stance

Maruki Palace Infiltration Guide

Coming Soon

First Infiltration (1/2)

  1. Head to the entrance hall.
    • Board the lift.
    • Head up the stairs and open the chest on the left.
    • Head up another set of steps.
    • Go through the double doors.
    • Make a beeline to the next door and you’ll be stopped for a cutscene.
  2. Take out the pair of Macabre.
  3. Head up to the test track.
    • Go around the door and up the stairs.
    • After facing the next stairs going up, turn around and then enter the door.
    • Watch the long cutscene.
    • You’ll regain control at the mezzanine, go around to the south and then enter the door.
    • Cross the bridge.
  4. Drive away Belial and Hastur.
    • Head to the nearest door for a cutscene.
    • Follow the path.
    • Cross the hallway to reach an open area.

Second Infiltration (1/9)

  1. From the main hall, head left and enter the door.
    • Follow the path similar to the one mentioned above.
    • After the dialogue, instead of heading up, go to the door on your left.
  2. Find a way to the auditorium.
    • Cross the access passage, and then make a left.
    • Take the stairs all the way up.
    • Finally, enter the door, the one found south of the map.
    • Head down the dark path for a cutscene.
  3. Defeat Cendrillon (boss).
  4. Locate the Treasure Persona Diamond and Orichalcum.

Third Infiltration (1/12)

  1. Defeat the group of Loa.
    • Take the same path that you took in the second infiltration.
  2. Head to the auditorium and use the grappling hook.
  3. Use the grappling hook again to reach the top.
  4. Go back through the passage.
  5. Defeat the shadows: Dionysus and Chimera.
  6. When you reach the warehouse, use the grappling hook to find a chest.
  7. March to the monitor room.
    • Make a pitstop at the safe room.
  8. Knock out Cu Chulainn and Scathach.

Main Infiltration

In Mementos, climb all the way to area 15 of Da’at, which takes you to the top, and finally deploy the cable. You’ll be facing some Shadows along the way so be prepared. A special event will occur and the Palace’s name will be revealed. After stumbling upon a new area, head straight for a cutscene. When you regain control, exit Mementos.

The trip around ??? tends to leave you at low SP which means you need some form of SP recovery. Before taking the heist, stock up on some SP recovery items.

Monitor Room

  1. Head to the back of the monitor room.
  2. Examine the security door.
  3. Find the red will seed.
    • Go around back and head through the ventilation hole.
    • Leap across the platforms. You’ll eventually drop down and find a door wrapped in vines.
    • Interact with the door to find the Red will seed.
  4. Proceed to the next area.
    • Head out of the room housing the will seed, and you’ll approach a gap on the fence.
    • Jump down and cross the path, climbing some stairs.
    • Remove the lock and enter the door.
    • Approach the posters for a cutscene.
    • The door is locked and won’t budge so you have to find another way.
    • Head far south of the map, and enter the ventilation hole at the corner.
  5. A cutscene will occur.
    • You’ll reach a thrashed research area, inch closer for a long cutscene.
    • Turn around and unlock the double doors.
    • Follow the path straight to return to the other locked door.
  6. Examine the door to find that it’s locked. When prompted, choose “Lover.”
  7. After putting the code, you can now head to the lab building.
    • Board the lift.
    • Exit through the door to the Lab Research Ward.

Lab research ward

  1. Find the Green will seed
    • Approach the left side of the map and shatter the glass.
    • Drop down and cut the vines to find it.
  2. Go to the second floor
    • Head to the messy research area.
    • Approach the computer for a cutscene.
  3. Unlock the door with a passcode
    • Exit the room and then turn right to climb the spiral staircase.
    • Make a diagonal beeline to enter the door with a padlock.
    • Select “Proof” to unlock it.
    • Follow the path until you reach the lobby.
    • Speak to the Shadow at the counter.
  4. Laboratory Safe Room
    • Exit the Safe Room.
    • Make a left and go up north.
    • Enter the door to reach the psychological exchange room.
  5. Two-color psychological room (Red,Blue)
    • Interact with the panel in the middle.
    • Head to the red area and inspect the table for a roundtable discussion.
    • Approach the red section and operate the lever.
  6. Three-color psychological room (Red, Blue, Grey)
    • Enter the double doors.
    • Hug the left wall and open the door.
    • Ignore it for now and operate the panel in the middle of the room.
    • Approach the blue side room and use the desk to “think.”
    • When asked again, choose “Organize.”
    • Head to the grey side room and pull the lever.
  7. Five-color psychological room (Blue, Cyan, Red, Yellow, Green)
    • Head to the rightmost room and organize your thoughts.
    • Go to the cyan colored side and use the lever.
    • Open the chest.

Treatment Room

  1. After the cutscene, turn around and squeeze through the duct.
    • Swing by the Safe Room.
  2. Head to the middle of the map and enter the door on the right.
  3. Interact with the monitor.
  4. Go back and follow the middle path between the two stairs.
  5. Defeat “The Shrinking Giant.”
  6. Pick “I want to be that person” to release the lock.
  7. Take the elevator.

Continuing Monitor

  1. Solve the first panel
    • Turn the red dial to full.
    • Do the same for the blue dial to light up all three colors and then press Ok.
  2. Defeat Fafnir to clear the path for the Blue will seed.
  3. Solve the second panel.
    • This one starts off with both the green and the blue lit up.
    • Turn the red dial and press Ok.
    • Ascend the long stairs.

Twilight Recovery

  1. Enter the safe room.
  2. Go back outside, sticking to the right wall and enter the nearest door.
  3. Interact with the monitor.
  4. Head back and approach the locked terminal.
    • Select “Persona’s Complete Awakening” to release the lock.
  5. Defeat Siegfried.
  6. Board the lift to enter the garden.
  7. Return to the main entrance.

??? First Boss Guide

Outcome Model Eden (2/3)

  1. Approach the steps and use the grappling hook.
  2. Ascend the long spiral.
  3. Defeat the boss.
  4. Defeat the final boss.
← Shido Palace Depths of Mementos

Other Palace Guides

Persona 5 Royal Palace Guides
Kamoshida Palace Madarame Palace Kaneshiro Palace
Futaba Palace Okumura Palace Niijima Palace
Shido Palace Depths of Mementos World of Qlipoth
New Palace

Persona 5 / Persona 5 Royal Recommended Article List

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News and Features Story Walkthroughs Palace Guides
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    • I was stuck on the last video tape, so I’ll guide you. From the room with the tv, go up the stairs. A cutscene with two red shadows pops up. Go to the fourth room on your right. Use the Third Eye to find where you can hop up to a vent. Go through it and drop into the room. Check the box on the shelf and there it is. I hope that was helpful.