You’re asking about “what to do with rare ergo,” which (from current online chatter) almost always refers to Rare Ergo in the game Lies of P —the special boss-drop currency. I’ll answer in that context and format this like a short, SEO-friendly “Quick Scoop” explainer.

What To Do With Rare Ergo (Quick Scoop)

Rare Ergo in Lies of P is basically your “boss soul” resource: you can either cash it in for a chunk of regular Ergo or trade it for unique weapons and amulets later in the game.

If you’re unsure: in most cases, do NOT consume Rare Ergo early—save it for unique gear.

Rare Ergo vs Normal Ergo

Think of two “currencies” you’re juggling:

  • Normal Ergo
    • Drops from enemies and can be farmed infinitely by playing more.
* Used to level up, buy consumables, and upgrade gear.
  • Rare Ergo
    • Drops from major bosses, and you usually get one of each per playthrough.
* Can be consumed like a big XP/currency packet _or_ traded later for special items.

Because normal Ergo is farmable but each Rare Ergo is limited, the long-term value of Rare Ergo is much higher.

Your Main Options With Rare Ergo

1. Consume it for a big Ergo boost (short-term power)

You can use Rare Ergo like a huge pile of regular Ergo:

  • Gain a bunch of Ergo instantly and:
    • Push a level or two you’re short on
    • Buy extra healing items or throwables
    • Grab an upgrade material you desperately want before a tough boss
  • This is tempting if you’re stuck or underleveled and just want immediate power.

Downside: once you consume it, that specific Rare Ergo is gone for that run; you lose access to the unique weapon/amulet tied to it unless you go to New Game+ and get it again.

2. Save it to trade for unique weapons/amulets (long-term value)

This is what most experienced players recommend:

  • After progressing the story, you’ll meet Alidoro , the treasure-hunter merchant (the dog–masked guy) in St. Frangelico Cathedral Library / Area IV.
  • Send him to Hotel Krat (the safest and recommended hub for him).
  • At Hotel Krat, he lets you trade each Rare Ergo for:
    • A special boss weapon , or
    • A powerful amulet with unique effects

You only get one pick per Rare Ergo —weapon or amulet—so each piece is a meaningful decision.

Because:

  • Normal Ergo can be farmed,
  • But these weapons/amulets are locked to boss Ergos and playthroughs,

…saving Rare Ergo for Alidoro is usually the smarter, long-term choice.

Practical Advice: What You Should Do

If you’re still early or mid-game and wondering “what to do with Rare Ergo,” here’s a simple decision flow:

  1. Don’t consume Rare Ergo as soon as you get it.
    • Treat it like a collectible until you reach Alidoro.
  1. Reach St. Frangelico Cathedral and meet Alidoro.
    • Find him near the Cathedral Library stargazer and send him to Hotel Krat.
  1. Once he’s in Hotel Krat, check his shop:
    • Look at the unique boss weapons and amulets tied to the Rare Ergo you own.
 * Ask yourself:
   * “Do I want a flashy, unique weapon for this run?”
   * “Would a strong amulet synergize better with my build?”
  1. Only consume Rare Ergo if:
    • You’re completely stuck, you need a couple of levels right now, and you don’t care about that specific boss weapon/amulet this run; or
    • You’re in late game or New Game+ polishing a build and already grabbed the gear you care about.

Different Playstyles, Different Choices

How you use Rare Ergo can change depending on your goals:

  • First playthrough, blind experience
    • Save Rare Ergo; grab weapons or amulets that fit your favorite playstyle so you can enjoy the “cool boss gear” fantasy.
  • Struggling player who keeps dying
    • It’s not “wrong” to consume one Rare Ergo to push a critical level or buy healing items if that’s what keeps the game fun for you.
* Just know you’re trading future uniqueness for present comfort.
  • Min-maxer or completionist
    • Always save Rare Ergo, plan which rewards you’ll take this run, and use New Game+ for the rest.
  • Fashion/variety enjoyer
    • Prioritize the most interesting weapons first; you can always grind normal Ergo for levels later.

Quick FAQ (Forum-Style)

Q: I already consumed a couple of Rare Ergos. Did I ruin my save?

No, not ruined; you can still finish the game and have fun. It just means those unique items will have to wait until New Game+ when you can earn those boss Ergos again.

Q: Is there any Rare Ergo that I must save, no matter what?

Nothing is strictly mandatory for story progression, but many players regret consuming early boss Ergos because they later see the unique weapons they could have had.

Q: Do I ever get more than one of the same Rare Ergo in a single run?

Normally, you only get one of each boss’s Rare Ergo per playthrough, so your choices with them are limited and meaningful.

SEO Bits: Latest News & Trend Context

  • Lies of P and Rare Ergo usage have been widely discussed in forum threads and guides since the game’s 2023 launch, with many players warning others not to “panic-consume” Rare Ergo.
  • The current “meta” advice:
    • Save Rare Ergo for Alidoro’s unique gear on your first run ,
    • Use normal Ergo and farming to handle most leveling and shopping.

TL;DR

  • What to do with rare ergo:
    • Save it until you meet Alidoro and reach Hotel Krat.
* Trade it for **unique weapons or amulets** instead of consuming it for quick currency—unless you’re truly desperate for a level.

Information gathered from public forums or data available on the internet and portrayed here.