Mouth of Grolantor

Mouth of Grolantor
Hill giants know the kinds of foods that make them fatter, and they understand that exerting themselves too much tends to make them thinner. What the lazy brutes don't comprehend are the things that make them sick. They consume spoiled food and diseased carcasses with as much enthusiasm as children eating dessert. Fortunately for hill giants, they have a vulture's constitution and rarely suffer for such eating habits. This makes it all the more mysterious to them when one of their kind becomes ill and incapable of keeping down food. Vomiting hill giants are seen as vessels of a message from Grolantor.
The clan separates the sickened giant from the others, often trapping the giant in a cage or tying the giant to a post. A priest of Grolantor or chieftain visits the famished giant daily, trying to read portents in the puddles of bile the hill giant retched up. If the sickness soon passes, the hill giant can rejoin society. If not, the hill giant is instead starved to the point of madness so that Grolantor's hunger can be given a mouth in the world.
Starved and Insane
A mouth of Grolantor is so disgraced that it ceases to be an individual and becomes an object. Paradoxically, that object is revered as a holy embodiment of Grolantor's eternal, aching hunger. Unlike a typical thick, sluggish, half-asleep hill giant, a mouth of Grolantor is thin as a whippet, alert like a bird, and constantly twitching around the edges. A mouth of Grolantor is kept perpetually imprisoned or shackled; if it breaks free, it's sure to kill a few hill giants before it's brought down or it sprints away on a killing spree. The only time a mouth of Grolantor is set loose is during a war, a raid against an enemy settlement, or in a last-ditch defense of the tribe's home. When the mouth of Grolantor has slaughtered and eaten its fill of the tribe's enemies, it passes out amid the gory remains of its victims, making it easy to recapture.