Recover fixed upgrade materials after chapter progress

Previously visited chapters reached through Stargazer travel, including the Center of Venigni Works lower mine.

Before you go

Check your weapon inventory and enhancement menu to identify the missing material family and tier.
Use Stargazer travel to return to the relevant chapter, such as Center of Venigni Works.
For the mine pickup, descend the two ladders and check the barricade on the left wall; let the puppet break it to reveal the Covenant stone.
Search opposite that point near the two pickaxe puppets for the separate Hidden Moonstone.
Collect only the material you had previously missed, then return to Hotel Krat and verify it appears in your inventory.
If the fixed pickup is gone, move on to another supported source such as available shop stock or a butterfly encounter.

Keep a short list of the exact item name you need; normal and special weapon stones are easy to mix up.
Chapter revisit is useful for missed exploration, while enemy respawns are for Ergo and do not restore collected pickups.

Each fixed pickup is available once per playthrough. Revisit only to claim a missed collectible; no reset loop reproduces it.

Do not keep resting in an area expecting a fixed Moonstone to respawn.
Do not collect the nearby Hidden Moonstone and assume it is the Covenant stone.
Do not revisit a chapter without checking which material the weapon actually needs.

Stop when the missed item is collected or when the location is already cleared; switch to shop stock or eligible enemy drops for further materials.

Sources & fact checks

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

Progression pickups

Return to chapters for missed fixed blade materials and distinguish collectibles from repeatable enemy drops.