From FFXI Wiki
- Speak with Horatius inside of the Trader's Home at (I-9) in Bastok Markets, who sends you to Dangruf Wadi. Make sure you're of a decent level when you do the quest, as some monsters in the area will agro past level 20.
- Inside Dangruf Wadi, head to the (I-5)/(J-5) boundary, where you'll find a ??? during sunny weather. Sunny weather is the default weather with no icon. If there is a weather at the time you're attempting this quest, you will have to wait for it to clear up to find the ???. You receive the Dangruf Stone after choosing to check the area.
- Head back to Horatius for your reward of 400g.