Dead Man's Chest: Epic battle and no loot?

[Laezyre]

I'm a level 41 Soothsayer and just had the toughest and most fun fight yet with dead man's chest. After the fight there was no loot or any story. Is this a bug or just a disappointment?
I noticed another post with a picture of the chest and he got no loot either.

[lasvegas]

I found no relation of that chest to any quest. That is a standalone fight IMO. The battle was not that hard for me and i also got no loot/no journal input for it