Grom is a substance created by Dreugh.[1] When a Dreugh undergoes Krevinasim, they live on land. Their body creates organs and certain skin to survive on land. When a Dreugh returns to aquatic life, they eat their own organs and skin that are not needed anymore. After they finish ingesting the organs and skin, they vomit it up. The vomit is in an orb shape, and thus is called Grom.[1]