Crystal Amaquelin is a princess of the Royal Family of the Inhumans and the younger sister of Medusa, Queen of the Inhumans. Like other Inhumans, Crystal was exposed to the Terrigen Mists at a young age to gain powers through Terrigenesis, acquiring the ability to psychically control the classic elements of air, earth, fire, and water. Crystal is often accompanied by her loyal companion, Lockjaw.