(Judging from the equipment scattered around, these corpses belong to grave robbers.)
(This one has better clothing and gear—they were likely the leader.)
(The robber is still tightly clutching a well-oiled leather bag.)
(Inside are a notepad and a small silver device that looks like a wheel.)
(On the notepad is a list of Atreian treasures and where to find them. Some of these items have an X marked next to them.)
(There is a fresh mark next to Silver Blade Rotan. It's safe to assume that the small wheel is related to this treasure.)
(You take the Rotan Summoning Object from the grave robber's bag and put it in your cube.)
Go to [%dic:STR_DIC_N_IDCromede_Rotan_body]and obtain[%dic:STR_DIC_E_skill_idcromede_02].
Find something to summon Silver Blade Rotan.
You found the Rotan Summoning Object on a grave robber's corpse.