[Name: Alex]
[Age: 17]
[Str: 25] (Avg: 30)
[Spd: 32] (Avg: 30)
[Int: 81] (Avg: 25)
[Skill: Storage, Sword Arts, Rapid regeneration, Heightened comprehensibility.]
[Soul Energy: 385]
[Upper limit: 500]
[Lower limit: 25]
...
The main benefit of working hard to improve soul energy manipulation is the gradual elevation of one's average soul energy—a steady baseline that the soul energy returns to after rest unless it falls below the lower limit.
The last time Alex checked when he first used the grimoire, his average soul energy was around two hundred and eighty. But now, it has increased significantly in such a short time.
Not only that, with rapid growth and prolonged stay above the upper limit, it even increases the range of the upper limit to restrict one's growth.