Lies of P | All Trinity Keys and Trinity Sanctum Locations

There are many secrets hidden around the city of Krat in Lies of P. Among the most intriguing are the Trinity Sanctums, also known as Trinity Rooms. These special hidden areas are scattered throughout the game and can be unlocked using rare Trinity Keys. Inside, you’ll find valuable resources, Quartz for your P-Organ, and unique outfits. Unlocking all five Trinity Sanctums is also required for the Platinum trophy, as it earns you the End of Riddles achievement.

However, both the rooms and the keys are well-hidden. Trinity Keys can only be obtained by finding specific phone boxes and answering riddles posed by Arlecchino, the King of Riddles. This guide covers where to find every Trinity Key and how to unlock all Trinity Sanctums in Lies of P.

You can also check out our review of Lies of P. 

1. How to Find All Trinity Keys in Lies of P

Trinity Key 1 Location and Riddle Solution

The first Trinity Key is obtainable after defeating the Scrapped Watchman, the second major boss in Lies of P.

1. Before entering Venigni Works via the bridge, look for a small side street to the right.
2. At the end of this street, overlooking the waterfront, find Arlecchino’s first phone box.

The riddle asks about a creature that stands on different numbers of legs during different times of day. The answer is Human. Answer correctly to receive the first Trinity Key.

First Trinity Key Location

Trinity Key 2 Location and Riddle Solution

The second phone box is easier to locate and appears on the main path in the Malum District, an area you visit after defeating Fallen Archbishop Andreus.

1. Start from the Malum District Stargazer.
2. Proceed to the large open area with a burning stake and a roaming Carcass mini-boss.
3. Head into the back alleys behind this area.
4. Follow a narrow road where a Carcass dog bursts from a cage.
5. Defeat more Carcasses and climb the ladder to reach the second phone box.

The riddle’s answer is Candle. You receive the second Trinity Key whether you answer correctly or not.

Trinity Key 3 Location and Riddle Solution

The third Trinity Key is found in the Grand Exhibition Gallery, accessible after defeating the King of Puppets.

1. Proceed through the museum until lowering a platform from the skyline, opening a previously inaccessible area.
2. Fight through rooms filled with puppets until a large industrial death machine breaks down a gate.
3. Continue up the stairs and turn right to find the third phone box.

The riddle’s answer is Egg. Instead of giving you the key directly, Arlecchino provides a note: “Behold the fingertips of the cold woman at the Grand Exhibition.”

1. Locate two statues beyond the phone box.
2. Interact twice with the right statue’s outstretched hand to rotate it toward the opposite statue.
3. This opens the idol in the center, revealing the third Trinity Key.

The Frozen Lady’s Fingers

Trinity Key 4 Location and Riddle Solution

The fourth phone box is in the destroyed version of Central Krat, near the end of the area.

1. From the Krat Central Station Street Stargazer, avoid the stairs leading to the Corrupted Parade Master.
2. Instead, turn around and navigate the back alleys toward the sea cliffs.
3. Turn right to find the ringing phone box.

The riddle’s answer is Ergo. You’ll receive the fourth Trinity Key regardless of your response.

Trinity Key 5 Location and Riddle Solution

The final phone box appears after the Hotel Krat is ransacked following your victory over the Collapsed Workshop Tower mini-boss.

1. Defeat the corrupted Parade Master and return to the Hotel Krat.
2. Antonia provides notes to play on the piano, opening a path to the Alchemist’s hideout.
3. From the Relic of Trismegistus Entrance Stargazer, proceed deeper underground.
4. In the large cavern, head left to a chest on a broken bridge.
5. Defeat the large puppet that bursts through the wall and continue forward to the final phone box.

The riddle asks: “Is Geppetto’s puppet a killer?”

• Answer Yes for Humanity points and Arlecchino’s favor.
• Answer No for his scorn.

Either way, you receive the Chosen One’s Trinity Key, used exclusively for the final Trinity Sanctum.

The Final Phone Box

2. Where to Find All Trinity Sanctums in Lies of P

Trinity Sanctum 1 Location and Rewards

Access the first Trinity Sanctum as follows:

1. Start at the Workshop Union Culvert Stargazer.
2. Ascend the slope with flaming metal balls.
3. Defeat the puppet that breaks through the wall.
4. Follow the new path outside.
5. Walk past Red Fox and Black Cat into another tunnel.
6. Head right past three puppets to reach the first Trinity Door.

Rewards from the first Trinity Sanctum:

• Blue Blood’s Tailcoat outfit

This outfit is worn by P in promotional material and offers stylish visuals in-game.

Blue Blood’s Tailcoat

Trinity Sanctum 2 Location and Rewards

To find the second Trinity Sanctum:

1. Head to the St. Frangelico Cathedral Chapel after defeating Fuoco, the King’s Flame.
2. Follow the main path upward through fragile platforms while avoiding acid-throwing Carcasses.
3. Evade the rolling electric ball hazard near the top.
4. Instead of moving forward, climb the ladder higher up.
5. Avoid additional hazards to locate the second Trinity Door.

Rewards include:

• Black Cat’s Amulet (in NG)
• Monster Sweeper’s Hunting Apparel
• Quartz (in NG+ instead of the amulet)

Monster Sweeper’s Hunting Apparel

Trinity Sanctum 3 Location and Rewards

Find the third Trinity Sanctum in the Estella Opera House during the Rosa Isabelle Street segment.

1. Unlock the shortcut through the opera’s main floor leading to the Puppet King boss fight.
2. Cross the wooden beam beneath a swinging flaming chandelier.
3. Drop down into the dark area beneath the beam.
4. Locate the green metal doors of the Trinity Sanctum.

Rewards from this room:

• Belford Superior Radiation Converter, improving defense against the Overheat status effect.

This is the only Trinity Sanctum without a unique outfit reward. 

Belford Superior Radiation Converter

Trinity Sanctum 4 Location and Rewards

The fourth Trinity Sanctum is found in the transformed Krat Central Station following the Green Puppet Devouring Monster fight.

1. Reach the Krat Central Station Lobby Stargazer after defeating the Robber Weasel Stalker.
2. Before exiting to the main streets, turn left to a previously locked room now blown open.
3. Climb the stairs inside to the fourth Trinity Sanctum.

Rewards include:

• Workshop Master’s Workwear outfit
• Carrier’s Amulet +1
• Full Moonstone of the Covenant in NG+

Workshop Master’s Workwear

Trinity Sanctum 5 Location and Rewards

The final Trinity Sanctum lies in the Alchemist’s Isle. It requires the Chosen One’s Trinity Key.

1. Continue to the Arche Abbey Outer Wall Stargazer.
2. Cross the bridge guarded by the Gatling Gun Alchemist and kick down a ladder for a shortcut.
3. Climb another ladder deeper into the Abbey.
4. Carefully descend the large central drop via wooden beams.
5. At the bottom, choose the right path to find the final Trinity Door.

Be cautious of a mini Victor puppet ambush before unlocking the room.

The Final Trinity Sanctum

Inside the final Trinity Sanctum, you discover Arlecchino himself, revealed as a puppet. He poses his last riddle: “Are you, Geppetto’s puppet, a killer?” Regardless of your answer, you receive the final reward:

• Alchemist’s Cape outfit

This outfit features elegant black and emerald green colors fitting the masters of Krat.

That covers how to find all Trinity Keys and unlock all five Trinity Sanctums in Lies of P.

Best Guides for Lies of P

King of Puppets and Romeo Boss Guide

How to Get the Blue Blood's Tailcoat Outfit in Lies of P | P Key Art Outfit Location

Players' Voice GOTY Results Narrowed Down to 10, Round 2 Voting Now Open

Review | Trying to Be a Real Boy (PS5)