Short answer
Check the Arcane requirement shown by the current progression interface, then verify the unlock in a subsequent run. Public query demand is clear, but the older gems, Lost Crown, and Jewellery Box recipes are not safe to publish as current facts without a matching release-build capture.
Verification workflow
- 01
Open progression and capture the Arcane target exactly as displayed, including any run, score, item, or guild condition.
- 02
Complete the condition without changing the save context midway; migrated and fresh saves may expose different targets.
- 03
Start a new run and confirm Arcane appears in the guild selection or pool.
- 04
Keep historical recipes in your notes only until they match a current screenshot or official release note.
This note separates what public sources establish from what should be checked in the current game build. Do not turn an old Demo screenshot or a community recipe into an exact current requirement.