Medrod's companions conclude that there are multiple winged eyeballs, and therefore there are more victims yet to be found.
This quest is available if you have completed both of the following quests:
Starting the Quest
Talk to Medrod in Fallgourd Float in the North Shroud to begin the quest.
Search for a Maiden's Corpse
Go to the location that the orange arrow on the minimap is pointing to. You will find a purple circle. Dismount and enter the circle, and a Floating Eye will attack. Kill it, then check on the Mangled Corpse.
Deliver the Ravaged Corpse to Aethelmaer
Go back to Fallgourd Float and enter the building where the quest destination is marked on the map. Talk to Aethelmaer and hand over the mangled corpse to complete the quest. There will be a cutscene.