After the first successful case, Orochimaru conducted another thirty Extremis Virus injection experiments simultaneously. Karn had supplied a substantial amount of serum in one go, but Orochimaru used it all.
If everyone in this batch succeeded, then after two more successful batches, Nawaki and Karn could receive the serum injections.
While they were at the Experimental Base, Orochimaru had approached Karn privately, hoping to trade for a vial of Extremis Virus Serum. He offered his entire collection of ninjutsu in exchange, but Karn did not agree to the trade and simply gave him a vial instead.
Producing the Extremis Virus was no great difficulty for Karn. Besides, Orochimaru currently had little worth offering. He had not yet read the Scroll of Seals, and his ninjutsu still consisted mainly of snake-based techniques and release techniques.
Orochimaru's greatest value lay in the man himself. From now until Boruto: Naruto Next Generations, roughly forty years would pass, yet Orochimaru single-handedly advanced biotechnology to the level of rejuvenation and human cloning.
It would not be an exaggeration to say that someone like him was cursed by knowledge. The reason Orochimaru became a villain despised by everyone was that he had not become Hokage.
If he had become Hokage before researching forbidden techniques, he would have become someone like the Second Hokage, perhaps even surpassing him in biological research. After all, once Orochimaru became Hokage, he probably would not have had the inclination to delve into politics and target the Uchiha.
While Orochimaru conducted the batch serum trials, Tsunade and Karn prepared to make a trip to Konoha together.
Tsunade returned to Konoha periodically. She was also responsible for the Medical System Reform, and although much of it was already on track, with one plan after another progressing smoothly according to Karn's suggestions, she still