Michael Moorcock 
Queen of the Swords 

The Second Book of Corum: the Prince in the Scarlet Robe.Fresh from victory over the Chaos Lord, Arioch, Prince Corum must battle the forces of Xiombarg, the dreaded Queen of the Swords, whose armies are close to delivering control of five planes of existence to Chaos, the forces of Law all but defeated.Corum and his allies enter the fray, though the odds are stacked against them. Their only hope lies in locating the advanced weaponry of the fabled City in the Pyramid. But the City is besieged by the forces of Chaos — and the Chaos Lords are now sworn enemies of the Prince in the Scarlet Robe…