Rise of the Runelords
A vargouille is larger than a human head, typically between 12 and 20 inches high with a 15- to 35-inch wing span.
Vargouilles are not natives of the Material Plane but can often be found there nevertheless, occupying graveyards, ancient battlefields, or anywhere one can find remnants of death and decay. These hideous monsters come from the fiendish outer planes, where they flop and flap through strange and haunted skies in constant search of fresh souls to torment. In these nightmare realms, vargouilles play a role similar to that of a raven or vulture, although they augment these roles with a malevolent delight in causing pain and anguish that no scavenger bird could ever hope to match.