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Here's a simple walkthrough from Finn :D

1. Activate the mechanism at the end of the path, then backtrack to the gate and grab the Rune Stone from the chest.
2. Pick up the Astral Shard near the statue.
3. Pick up the Silver Key (Underdark Key) on the ground.
4. Dispel the Magical Seal (Inventory → Special Items → use Astral Shard).
5. Open the chest to obtain the Revelation Rune Stone.
6. Rotate the mechanism to get the Earth Materia.
7. Rotate the other mechanism to get the Fire Materia.
8. Insert the 3 materia (Fire, Earth, etc.) into the pillar to open the door.
9. Talk to Puck inside the cage.
10. Return to the statue and rotate it when you hear the “click” (the bridge mechanism unlocking).
11. Cross the bridge and pick up the Soream Key.
12. Go back to Step 9 and talk to Puck in the cage again.
13. Fight the bull-like enemy.
14. After the fight, there’s a consensual intimate/NSFW scene with Puck, and the quest ends.