Preserve boss Ergo for Alidoro’s exchange

Alidoro’s special equipment exchange at Hotel Krat or his available location after his service is unlocked.

Before you go

After defeating a boss, check your inventory for its special Ergo reward.
Do not use the item if you may want the weapon or amulet it can unlock.
Reach Alidoro once his exchange service becomes available.
Open the exchange options for the specific boss Ergo you retained.
Compare the offered special weapon and amulet against your current equipment and intended build.
Choose one item and complete the exchange, or leave the Ergo unused if you need more time to decide.
Equip the selected item and check its upgrade path before spending Covenant Moonstones.

Consider whether the boss weapon’s moveset or the amulet’s effect fills a real need in your setup.
Keep in mind that saving the Ergo delays its use as ordinary currency; make the choice before an urgent level-up if possible.

Each boss Ergo is a limited reward for that playthrough and normally supports a choice from its exchange options. It is not a repeatable farm.

Do not consume boss Ergo for ordinary Ergo before checking Alidoro’s options.
Do not assume the exchange provides both rewards; compare and choose the offered item you want.
Do not spend special weapon stones before checking whether the exchanged weapon uses them.

Stop once you have chosen and exchanged the boss Ergo, or keep it safely unused until one option is clearly more valuable.

Sources & fact checks

Open a guide to find other locations and see what the item is used for.

Special weapon materials

Keep a boss Ergo available until you decide between its special equipment and ordinary currency value.