DISCLAIMER: Your Steps and Tasks may be different
Growling Ghost is the main quest, this is a subquest.
1. Find Cyfwich Diwych in Camelot Hills and get Growler's Neclace (far NE
corner of Camelot Hills) He's a bandit found on the road to Castle Savauge. A few bandit camps are located to the right of the road enroute there (basically past Mithra). There are three camps there, each camp has a "Diwych" at it cause they're brothers, but only one camp has the right one that you need to kill. Just make sure the name matches, his exact location is: 50043, 12549.
2. Return Neclace to Growler
3. Free his bones (slay him)
Return to Sargeant Alain to finish The Growling Ghost quest.