Shadow Series Series by C.N. Lesley

Fortune twists in the strongest hands. This is no repeat; this is what happens next. A man, once a legend who bound his soul to his sword as he lay dying, is now all but a boy nearing the end of his acolyte training. Stifled by life in the undersea city of Avalon, Arthur wants to fight side by side with the air-breathing Terrans, not spend his life as servant to the incorporeal sentient known as the Archive... moreFortune twists in the strongest hands. This is no repeat; this is what happens next. A man, once a legend who bound his soul to his sword as he lay dying, is now all but a boy nearing the end of his acolyte training. Stifled by life in the undersea city of Avalon, Arthur wants to fight side by side with the air-breathing Terrans, not spend his life as servant to the incorporeal sentient known as the Archive. Despite the restrictions put on him by Sanctuary, he is determined to help the surface-dwellers defeat predators whose sole purpose is to ensure their own survival, no matter the cost. Ashira, War Maid and princess of the surface-world, is ready to sacrifice her life to defend her kin, but when she is betrayed and cast out of the life chosen for her, she must choose whether to die with honor or become one of the creatures her kinsmen fear and loathe. Following two threads of time, C.N. Lesley’s new incarnation of the Arthurian tales of old delivers the perfect blend of science fiction and fantasy. less

Arthur and Kai have escaped the threat of Emrys, but now they must face life on the surface world-and all the fearsome creatures that dwell there. But just as they assemble the beginnings of a fighting force, they discover a vital component to their safety has been compromised. This means a return to Avalon, where Arthur has an unexpected encounter with the untrustworthy Merlin. The magician's orders are clear: Arthur must find the sword to save the surface-dwellers and Avalon... moreArthur and Kai have escaped the threat of Emrys, but now they must face life on the surface world-and all the fearsome creatures that dwell there. But just as they assemble the beginnings of a fighting force, they discover a vital component to their safety has been compromised. This means a return to Avalon, where Arthur has an unexpected encounter with the untrustworthy Merlin. The magician's orders are clear: Arthur must find the sword to save the surface-dwellers and Avalon. There is no alternative. Kiri Ung, leader of the Nestines and ultimate controller of the Terran slaves on the surface, needs Arthur in order to ensure of the continuance of his species. With the Nestine Queen dying, failure means ultimate extinction. Wherever Arthur goes, so goes Kiri Ung. Whoever finds the sword first gains control over all humanity. But simply gaining possession of this powerful artifact is not enough to wield its power. Let the battle commence. less