The Third Book of Swords
Fred Saberhagen1984

Coinspinner, Farslayer, Mindsword, and nine more — Swords of Power forged by Vulcan in the eternal fires, given to humankind by the gods for inscrutable, but certainly malicious, reasons of their own. But through Vulcan's own bitter whim, the Swords can kill gods as well as men — to the god's dismay, and to mortal woe !