Vol. 4The Chamber Across Worlds
Karn expanded his trade empire and pursued power across the Holy Grail War, space, and multiple worlds. The volume ended with him preparing to test Red Queen’s Rage Serum on Son Gohan.
- Karn built his businesses and alliances, explored space, and entered the Holy Grail War to protect Sakura and take control of the conflict.
- At the church, Jeanne d'Arc revealed Kirei Kotomine was also a Master.
- Karn ended the Holy Grail War, opened a passage to the Root, and merged the Kamui Dimension with Rin Tohsaka’s world.
- He expanded his operations across other worlds and left Alicia in charge of Umbrella as its secrets drew attention.
- Karn expanded the Chamber of Commerce across several worlds, defeated Asgard’s challenge, and established an operation in the Dou Qi continent.
- After capturing Ōtsutsuki Isshiki and dismantling Kara, he refused to pardon Asuma Sarutobi but offered to reduce his sentence if Kurenai Yuhi cooperated.
- Karn expanded the Karn Chamber of Commerce across the Northwestern Continent and into the Central Plains while Xiao Yan pursued strength after the Hall of Souls took his father.
- Karn crossed worlds, held the androids for study, acquired the Mind Stone, and prepared to test a serum on Son Gohan.