Hunter x Hunter (HXH) - Sage Of Nen

Conrad Everest, a young man with a deep fascination for Nen theory, finds himself reborn in the world of Hunter × Hunter. Unlike ordinary Nen users, he awakens a unique system known as Infinite Nen Abilities, allowing him to create, store, and manage countless Nen abilities without overwhelming his mind. His aura can be separated and allocated independently to each ability, giving him unmatched flexibility and control. Driven by his goal of becoming a true Nen scholar rather than a simple fighter, Conrad explores the depths of Nen mastery, studies its rules, and tests its limits within the dangerous world of Hunters. — Description from novelcodex.org