Defeat Capriton Guards and Capriton Wizards on the road up to Massacred Scorpion Base to collect Skeleton Bones. Give these to Captain Cromwell at the Great HessianTree. Use your quest tracker to see your progress.
Captain Cromwell: Take a good look at this, soldier. Take a good damn look Captain Cromwell: at it. Have you seen this before? NakanoAzusa: It looks like a skeleton's bone, sir. Captain Cromwell: It came from one of the cabritos. Do you know what Captain Cromwell: that means, soldier? Those damn goats are carrying Captain Cromwell: bones that come from evil skeletons, and those evil Captain Cromwell: skeletons come from the Abyss. NakanoAzusa: Sinclair is behind all of this?! Captain Cromwell: That's what it's looking like, soldier. Go collect more Captain Cromwell: bones and maybe we can find out more information.
Reminder Dialog
Captain Cromwell: Break their spirits, break their faces, break their necks. Captain Cromwell: Just don't break their bones! We'll need those.