Follow the pointing skeleton to a hidden Spirit Oil room
From Raider Captain Aganmi beside the wrecked boat, take the narrow uphill stone path away from the sea. Follow the ruined outer wall to the skeleton at the end of the passage between wall and rock. Face the wall its arm points toward and use Interact. Inside, collect Spirit Oil from the mossy stone in the left-hand corner. To use it, equip the weapon you want to improve, then select Spirit Oil → Use Item in your inventory.

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Walk from Aganmi to the pointing skeleton
Start: Raider Captain Aganmi, seated beside the wrecked boat at the shoreline. Use his name and the boat to recognize the starting point.

- Turn away from Aganmi and follow the narrow uphill stone path away from the sea.
- At the ruined stone wall and arch, follow the outside of the wall rather than searching the shoreline.
- Continue into the narrow passage between the wall and the rock. At its end, look for the skeleton with an outstretched arm.
If the turn around the ruins is hard to place, follow the continuous approach in LobosJr's recording, starting at 3:10:46, until the skeleton pictured below comes into view.

Interact with the wall and collect the oil
- Stand facing the wall indicated by the skeleton's arm and use your Interact control to open the hidden entrance. Swinging at the wall is not the action to rely on.
- Enter the room with purple flowers and a brazier. Check the mossy stone by the left-hand wall corner.
- Pick up the item and confirm the displayed name is Spirit Oil, as shown in the first image.
Done when: Spirit Oil has been collected and appears in your inventory. This guide covers this one pickup, not every Spirit Oil location.
Equip a weapon, then select Spirit Oil → Use Item
- Equip the weapon you want to improve before spending the oil. Note its current weapon level and experience bar.
- Open your inventory, select Spirit Oil, and choose Use Item from its menu.
- Check that the oil quantity decreased and inspect the equipped weapon's level and experience bar again.

In the recorded example, Pandora Blade is equipped at level 1 before use. One Spirit Oil is consumed, reducing its quantity from 1 to 0; the weapon is then shown at level 4. This is one observed result, not a fixed three-level bonus or a known experience amount for every weapon.

Using oil for a weapon-break task? Spirit Oil is not a guaranteed instant Trident break; weapon experience and the reported break condition are separate questions.