The men with no shadow are introduced in the fourth installment of the Icor Tales, although they are hinted at in the third installment. Their history is shrouded in mystery. What is known is that they used to be ardent followers of Uther. They gave their lives to serve as men with no shadow.
They cannot be seen except by Uther, their victims, and those who carry prime keys. They have a weapon called a tec’sla (a word whose etymology derives from the language of the ancients) which is like an icor arrow. The tec’sla cannot be blocked by an icor shield, and creates a wound that icor cannot be heal.