Use the unlocked expedition, not the tower reward assumption
The reference’s Dark Cave of Feybreak route unlocks after Feybreak Tower; the boss clear itself is not described as depositing the Cores. It requires 20 Dark Pals, recommends476,000 strength and takes60 minutes for a base2–3-Core reward before applicable bonuses. Additional suitable Pals can improve the dispatch without borrowing essential workers or the next raid army.
Compare the passive routes
| Expedition | Reported requirement | Recommended strength | Base Cores /60 min |
|---|---|---|---|
| Astral Frost Cavern | 20 Ice | 286,000 | 1 |
| Celestial Sakura Cavern | 20 Water | 375,000 | 1–2 |
| Dark Cave of Feybreak | 20 Dark | 476,000 | 2–3 |
| Sunreach Isle | 20 Dragon | 589,000 | 3–4 |
| World Tree ruins | 20 Pals | 851,000 | 3–5 |
Pair dispatches with an active route
The reference names ordinary Bellanoir, Moon Lord and the level 55 Oil Rig as active sources, plus guaranteed sources in Silvance and Dandilord records. Choose only encounters you can repeat without a long recovery. Use the item’s full source table for current quantities; raid and expedition rewards are different systems.
Reserve a Recycler only when its supply route exists
The cited Ancient Relic Recycler costs 50 Paloxite Ingots,50 Mythical Wood,30 Ancient Civilization Parts and 20 Ancient Civilization Cores. Reserving the first20 is useful if you can reach and sustain World Tree relic farming; it is not an absolute order to delay a survival upgrade that makes that route possible.
Interpret recycling chances as a separate roll
The source gives Decayed relics a20% one-Core outcome; later relic grades report5–10 Cores at24%,28.8%,34.56% and 41.472%. Those are attributed pool chances, not guaranteed returns or per-hour rates. Preserve resource protection and transport capacity during the relic run, then spend future Cores on one finished upgrade path at a time.