Treasure of the Thieves

Recently, I interrogated a large gang of thieves and learned about the location of a valuable treasure. I was going over to that location with my soldiers when my brain went numb. We were about to reach our destination. Fortunately, I managed to leave a mark before I lost my senses. Yet, I have no idea where it was. So, I want you to find that mark for me. I'm not even sure which direction it is, but my guess is, it's likely to be in the Dead Cliff. To be honest with you, I've been virtually everywhere and found nothing, so I'm in despair and in no mood to do anything. So, I hope you can do this for me. Suchen the trees in the Dead Cliff and bring the Visible Mark that you find.

It's not that I'm lazy. I'm just sick and tired of looking for the mark. I'm exhausted and asking you for a favor. Suchen the trees in Dead Cliff and bring back the Visible Marker.

Oh... If this was there, the treasure must be somewhere close. Let me think back again... Oh, are you still here? Thanks.