I did as the ghost asked. I have freed his spirit with the Hammerite artifacts he asked for. I bet they never thought a heretic like me would be performing thier rituals for them.
Now the ghost is asking for me to get the bodies of his friends so they can be buried. I saw the bodies earlier. They're in different parts of the cathedral. The still-haunted-as-hell cathedral. Whatever magic's in this sword still better be working.