Into the Labyrinth (Death Gate Cycle #6)

From his army of the undead, Xar, Lord of the Nexus, learns of the existence of the mysterious Seventh Gate. It is said that this gate grants whoever enters it the power to create worlds—or destroy them. Only Haplo knows its location—but he doesn't know he knows it. Now an ex-lover has been sent to betray Haplo and bring back his corpse. Meanwhile, the assassin Hugh the Hand is also after Haplo, wielding the Accursed Blade. With his old companion Alfred, Haplo must seek sanctuary in the Lab...