Lu Yi set his first target on the Xuanyin Yuanyang Immortal Scripture.
He used a designated Immortal Scripture Level Increase of +3.
He discovered that compared to the comprehension of the Tribulation Crossing Chapter, the speed of comprehension with the level increase reward was far slower.
Lu Yi wasn't surprised, after all, it was comprehension at the level of a Heavenly Immortal.
Lu Yi was currently only at the Tribulation Transcendence Realm. To comprehend the Heavenly Immortal Chapter was already quite an achievement, let alone expecting rapid progress.
It took more than a year for Lu Yi to fully digest this round of comprehension.
His Xuanyin Yuanyang Immortal Scripture had been elevated to Heavenly Immortal Chapter lv4.
In Lu Yi's plan, the Immortal Scripture he had extrapolated was centered around the Yin Yang Law, and the Xuanyin Yuanyang Immortal Scripture was the best core for it.