Insight I

Three days later.

Lu Sheng sat cross-legged with care at the center of an incomparably vast and intricate formation.

This formation was far, far larger than any of the previous ones.

If nothing unexpected happened, the difference in the flow of time this time should vastly surpass every prior attempt.

In one go, he had laid out the absolute limit of the formations he could construct. Disregarding energy levels, he searched only for worlds with the greatest disparity in time flow.

That way, even the smallest ratio would reach at least one to a hundred. Slightly greater ones could be one to several hundred, even one to a thousand or several thousand.

Such an enormous gap in time flow would be enough for him to gain insight within it for a long time.

Hiss.

Lu Sheng slowly erased one formation pattern controlling the energy level, then used a crystal blade to carve a new pattern in its place.

From time to time, he slowly injected Yang Essence into it, allowing the pattern to fully merge into the greater formation.

"Overturning Sea." Lu Sheng lightly tapped a finger against the ground of the formation.

Hiss. A metal sphere that had completely turned pitch-black slowly emerged from behind him.

"With the repaired and strengthened Overturning Sea Pearl as the formation core, it should be able to prolong the crack's duration and withstand greater space-time pressure.

"It would be even better if I could enlarge the crack." Lu Sheng already had some faint ideas. Ideally, he could use the formation to leave stable markers in both worlds.

That way, whenever he wanted to cross into a world he had visited before, it would be much easier.

Unfortunately, achieving that required an utterly colossal amount of energy. The energy of a single individual was