Advanced Gravediggers are gunners on the Horror. They use the Blades of The Ice Age.
1 - 50
Each time defeated you get the following:
Blades of The Ice Age
They can be found on The Horror. RARELY they are found on Cutthroat Isle during Port Royal invasions at levels 30 - 50. At the end of the invasion a skeleton flagship ship pops up at Cutthroat Isle and they walk into the water and disappear. If you board the flagship, there are 15 of them to defeat and you get 8 Skull Loot Chests from the flagship.