Khyber

Khyber is the dragon of darkness, chaos, and the underworld, imprisoned beneath the surface by Eberron. Her domain is the deep caverns and layers below the world, filled with aberrations, fiends, and ancient evils. Khyber dragonshards are found underground and are often used to bind extraplanar entities, power eldritch machines, or fuel sinister rituals. Khyber symbolizes destruction, ambition, and forbidden power.