Children of Heroes — Chad Westbrook

The epic story continues nineteen years later as Bjorn Thorgunson and Hiro Kishimoto continue their adventures in the strange world known as Zenia, Hiro finds himself imprisoned in Jyoseon with the Empress bent on bearing his child. Saya, his daughter sets out to rescue him but things aren't as they seem. Bjorn returns from the Inner Realms, chasing after a man named Kaius Noba who wields a device that could destroy the world ; unbeknownst to Rose who still seeks a way to bring him home. Their daughter, Astryd, sets out on a journey to find her mother and only finds trouble in return. Their destinies intertwine and gathers them together to stop Kaius Noba from conquering the world..