User blog comment:Lord Loss/Monster Appreciation Week: Goldbeard Ceadeus/@comment-6050823-20130825112439/@comment-6050823-20130825114812

Just found some more info.

It seems like whales, they feed on shrimp, plankton, and fish attracted to their glowing body. Plus it seems they may feed on Epioth when their near the surface.

Also like whales, it seems they may spit out ambergris and their gems and jewels maybe that.