After staying in that dark space for a while, Uchiha Feiyu ultimately chose not to sacrifice the black mist in his hand.
After all, the more black mist he stored, the better the things he could exchange for. Besides, Uchiha Feiyu was planning to use the highly costly Precise Sacrifice, so naturally, the more black mist he saved up, the better.
At present, he had more than enough ability to protect himself on the battlefield. And even if he exchanged for something good, it would be difficult to turn it into Battle Power in the short term—whatever inheritance he obtained, it would generally require time to cultivate.
Setting everything else aside, even the moves from that Evil-Exorcising Swordplay had taken a ninja of Hatake Sakumo's caliber several months of study without fully mastering them. Even now, he had yet to integrate them into the White Fang Sword Style. And those were merely the simplest moves; more profound inheritances would likely require even more effort to cultivate.
"Konoha's battlefield has a rotation system... Once this battle is over, I'll have spent nearly half a year on the battlefield. I can apply to return for half a year's leave, and I'll perform the sacrifice then."
"Perfect. I can kill more Sand Shinobi in this battle and gather more black mist!"
Having made his decision, Uchiha Feiyu stopped paying attention to his Demonic Path Inheritance Compendium and instead began intensive training focused on his fundamentals.
Generally speaking, once one's strength reached Uchiha Feiyu's level, making progress in a short time became exceedingly difficult.
Either one cultivated higher-level ninjutsu, such as Sage Art, Lightning Release Chakra Mode, the Flying Thunder God Technique, and other overwhelmingly powerful techniques.
Or one simply developed one's Bloodline Limit, such as raising the level of the Sharingan, or combining