Fred Saberhagen- The Second Book of Lost Swords: Sightblinder Story (Lost Swords #2)
Long ago, the gods forged Twelve Swords of Power and threw them on the gameboard of life to watch men scramble. But they had forged too well: the Swords could kill the gods themselves.
Now, the gods gone, the Swords are scattered across the land, some held by those of good heart, and some by evildoers.
One is held by Arnfinn, a country boy who knows nothing of Sightblinder’s power: to make the viewer see that which he most desires—or most fears.
Sightblinder must be used, if Ben of Purkinje is to rescue Prince Mark from the hell in which he lies captive, prisoner of the horrifying ageless Ancient One.