Prize: 5000 renown points.
Granny Miggins is worried about her grandson. He got lost somewhere in the Tomb of Heroes, which is located in the north-east part of the region in a lake (but the water is no longer there, so the entrance will be unlocked). Go forward all the time, and you'll get to a huge hall, with Charlie at its end.
Before you get to the surface, you will be attacked while opening the sarcophagus. You have to protect Charlie from the hollow men. After that, search the sarcophagus, you will find Looter's Note, and after a while more hollow men will attack. Follow the track to the exit, the platform will let you open the gate. After getting out, go to granny Miggins.