You generally should not consume boss Ergo for cash in Lies of P unless you’re sure you don’t want the boss reward. Boss Ergo is usually better saved and traded for special weapons or amulets from the NPC who unlocks boss- Ergo exchange.

What to do

  • Keep boss Ergo until you decide on the reward. It can be exchanged for unique boss weapons or amulets, which are often stronger or more interesting than the raw Ergo payout.
  • Only consume it if you need the Ergo immediately for leveling or upgrades and you’re okay giving up the special item.
  • Check the exchange options carefully before spending, because once you turn it into regular Ergo, you lose the special-trade value.

Practical pick

  • If you want the best long-term value , trade boss Ergo for the unique weapon/amulet.
  • If you want short-term progression , consume it for currency.

If you want, I can also give you the best boss-Ergo choices by boss without spoilers.