Planescape: Blood Wars Series by J. Robert King

When his uncle is abducted by a pair of gargoyles at the behest of an eight-armed god, Aereas joins his cousin Nina on a perilous journey into a bizarre and twisted world where they uncover a plot to turn the tide of the Blood War and unleash a horrific evil. Original. 75,000 first printing.

As the Blood Wars escalate across the various planes of existence, Aereas and Nina find themselves on opposite sides of the conflict--he in Sigil, she at the head of an evil abyssal army. Original. 75,000 first printing.

Aereas is dead. His daughter is growing up to be a beautiful woman, learning from her unle the business of espionage. Nina is close to dying. Her son is training in music at the shop of Boffo the Gnome. The Blood War itself still rages. Even the heavens shake with its fury, and they may well topple, unless these children of heroes truly bear their parents' blood.