You found all the pieces! Let’s see where this….oh.
Adventurer, this map, it points to a location in the depth of Mad Run. Some sort of ancient coffer is hidden there., Unfortunately there are no further clues. You will have to search within the caves there.
Look, Mad Run has a reputation for a reason. If you do venture there and this coffer, I will help you open it. But only go if you are sure - and bring friends if you fo. Powerful friends.
Stay alive adventurer.
Where can I find this Runed Coffer?