Lies of P: How to Find Alidoro and Use Boss Ergo

Alidoro’s role and the short answer

Alidoro is Lies of P’s boss-weapon merchant. The first reliable place to find him is in the St. Frangelico Cathedral Library area, where he appears after you take the elevator up to the balcony or open section above the cathedral. Speak to him there, choose where to send him next, and he becomes the NPC who exchanges boss Ergo for exclusive rewards.

The important part is not just finding him once. Alidoro matters because boss Ergo is usually a one-time choice between two different rewards, typically a special weapon or an amulet. On a single playthrough, that decision is effectively irreversible. If you accidentally consume a boss Ergo for normal currency before talking to him, you lose access to that unique trade for that run.

• First location: St. Frangelico Cathedral Library upper balcony/open area
• First routing choice: send him to Hotel Krat or Venigni Works / Workshop Union Entrance
• Best convenience choice: Hotel Krat
• Most important warning: do not spend boss Ergo casually before checking his exchange options

Where to find Alidoro for the first time

Your first meeting with Alidoro is tied to the cathedral section, not Hotel Krat. If you are searching the hotel early and cannot find him, that is normal. The earliest documented encounter is in the St. Frangelico Cathedral Library area. From there, use the elevator and move into the upper balcony or open space above the cathedral floor. That is the checkpoint most guides agree on, and it is the safest one to remember.

This encounter is easy to miss because the cathedral section pulls your attention toward the area boss and the surrounding shortcuts. If you are rushing progression, it is possible to leave the zone mentally focused on combat and not realize you just passed the game’s most important boss-reward merchant. If you are in the library and have elevator access, slow down and clear the upper section before moving on.

When you talk to him, the game pushes a routing decision instead of simply unlocking a permanent shop on the spot. That is where a lot of confusion starts, because players often assume the wrong answer can lock the quest. It does not work that harshly. The first choice changes where you see him next, but not the fact that he eventually becomes the merchant tied to Hotel Krat progression.

Should you send Alidoro to Hotel Krat or Workshop Union Entrance?

If you want the cleanest route with the least backtracking, send Alidoro to Hotel Krat. That puts him in the hotel’s back hall near Antonia’s room, which is the most convenient place to manage boss Ergo trades between major fights. For most players, this is the better first answer because it keeps your upgrade loop centralized in the main hub.

If you instead send him toward Venigni Works, multiple guides place him near the Workshop Union Entrance Stargazer. That is not a failed route. It simply means you will meet him there before he later relocates into the hotel as the story advances. In other words, the first choice changes short-term convenience, not the long-term merchant outcome.

There is also a small practical reward attached to this conversation in many guides, with a Fire Abrasive commonly mentioned. Some write-ups also note that the choice can slightly affect later dialogue or attitude. The shared point across sources is more important than the exact phrasing of those lines: both routes still lead to Alidoro becoming available as your boss-reward trader.

• Send him to Hotel Krat if you want easier access and fewer wasted trips.
• Send him to Workshop Union Entrance only if you specifically want to meet him there as you continue that route.
• Do not overthink the first choice as a permanent lockout. The merchant function still converges later.

What if you missed him before Fallen Archbishop Andreus?

There is a useful backup detail here, although not every guide emphasizes it equally. Some route notes say that if you miss Alidoro before beating Fallen Archbishop Andreus, he can relocate near the Archbishop’s Altar elevator, giving you another chance to direct him. Treat that as a fallback, not your primary plan, because the cathedral-library encounter is the more consistently documented checkpoint. If you think you skipped him, check that altar-side elevator area before assuming the quest is gone.

How Alidoro’s boss Ergo exchange actually works

Alidoro is not just another vendor with a rotating stock. He is the game’s conversion point for boss-specific currency. Each major boss drops an Ergo item that can usually be exchanged for one of two unique rewards. In practical terms, that means every time you beat a boss, you should pause before using that Ergo for anything else.

The safest habit is simple: never consume boss Ergo immediately after a kill. Hold it until you can review Alidoro’s options. Even if you are desperate for levels or upgrade materials, burning a boss Ergo for standard progression is usually the most expensive mistake you can make in the long term. Regular Ergo can be farmed back. A missed unique trade usually cannot, at least not until another playthrough.

As a rule, special weapons are usually better if you are still defining your build around moveset and damage identity, while amulets are often better if your weapon plan is already settled and you want a permanent passive benefit instead. The right answer depends on your build, but the wrong answer is spending first and thinking later. Alidoro’s value is entirely tied to that planning discipline.

• Keep every boss Ergo in your inventory until you have checked Alidoro’s trade list.
• Compare the reward to your current build, not just to raw curiosity.
• Assume you are choosing one reward, not both.
• If you are undecided, wait. There is no advantage to rushing the trade.

This is why Alidoro “performs” as one of the most valuable NPCs in the game. His usefulness scales with your progression. The farther you get, the more important his menu becomes, because your boss kills stop being only milestones and start becoming long-term build decisions.

Midgame relocation: where Alidoro goes later

After the early routing choice and your hotel access, Alidoro does not stay static for the entire story. Guides broadly agree that after the Black Rabbit Brotherhood fight and later progress through the Barren Swamp, you can find him standing by a bridge near the route to the first swamp Stargazer. This is the main midgame relocation to remember if you are tracking his full quest and not just using him as a shop.

This matters because his storyline stops being a simple merchant route and starts setting up the game’s late reveal. If you only ever think of Alidoro as the person who trades boss Ergo, the swamp checkpoint can feel strange. It is really the handoff from functional vendor to story-critical NPC.

The late-game reveal near Relic of Trismegistus

Near the Relic of Trismegistus Combat Field, Alidoro reveals that he is not the real Alidoro and that he has betrayed the hotel. Some guides foreground this twist early by referring to him as Parrot or “Alidoro the Hound, formerly known as Parrot,” while others mostly treat that as later story detail. Either way, do not let the naming differences confuse you. They are referring to the same merchant questline, with different emphasis on the fake-identity angle.

This scene is the trigger for the endgame choice to attack or spare him. That decision is not just role-play flavor. It affects what item you get and whether you can push a related NPC branch efficiently.

Should you kill Alidoro?

If your priority is clearing the related side content and getting the most concrete reward path, killing him is the important choice. Doing so gives you Alidoro’s Cryptic Vessel. You can then take that vessel to Venigni for deciphering, and bring the resulting information to Eugenie. That branch is tied to a record reward and to the reveal surrounding the “real” Alidoro.

If you spare him, you do not get that immediate vessel-based branch at that moment. That is the practical consequence to understand before choosing. If you care about Eugenie’s quest resolution and do not want ambiguity, the kill option is the clearer route.

Common mistakes that waste rewards or time

• Consuming boss Ergo too early. This is the biggest error in the whole Alidoro questline.
• Assuming the first destination choice is permanent. It changes the next meeting point, not the eventual merchant role.
• Looking for him in the wrong part of Hotel Krat. If you sent him there, check the back hall near Antonia’s room.
• Forgetting the Workshop Union Entrance fallback. If you sent him toward Venigni Works, check near that Stargazer.
• Thinking Parrot and Alidoro are different quest NPCs. Guide wording varies because of story framing.
• Missing the swamp bridge checkpoint. If you are following the full quest, that midgame relocation matters.
• Making the endgame choice blind if you want Eugenie’s branch. Killing him is the path tied to the Cryptic Vessel.

The checkpoints that matter most

The reliable Alidoro path is straightforward once you strip out the confusion: find him at St. Frangelico Cathedral Library, send him to Hotel Krat if you want the cleanest route, use him as your boss Ergo exchange merchant, track his relocation through the Barren Swamp, and make your final choice near the Relic of Trismegistus with the Cryptic Vessel branch in mind. The only truly irreversible parts are how you spend each boss Ergo and whether you kill him for Eugenie’s quest progression.