Rex slowly withdrew from the Warcraft System, a pained look in his eyes.
The changes in the Warcraft System told Rex that restoring it would cost an enormous sum of gold coins. Before long, however, his attention shifted away from the system, and a bottle of glowing green Greater Potion of Healing appeared in his hand.
[Greater Potion of Healing; restores 500 health.]
The description was brief, but after discovering how precious the Life Manual was, Rex already understood what life force represented. The fact that the Life Manual's 50 health meant five years of lifespan told him a great deal.
In the game, the Greater Potion of Healing was classified as a consumable treasure, and the same held true in reality. Yet its value was no less than that of a permanent enhancement treasure, and might even be greater. Based on his analysis, Rex now had a clear understanding of the difference between restoring life force and increasing it. All he needed was one final experiment to confirm his conclusions.
Increasing life force was like enlarging a bottle, while restoring life force was like replenishing the water inside it. No matter how much was restored, it could never exceed the bottle's capacity. Thus, the greatest effect of the Greater Potion of Healing was to restore a person's lost youth, not increase their lifespan. For instance, it could not replenish the ten years of lifespan Rex had lost.
Once the bottle of Greater Potion of Healing appeared in Rex's hand, a potential recipient involuntarily came to mind: the father he had acquired in this world. King Genn was already old. Although he was quite strong and had reached the ninth rank, he had no hope of breaking through to Hero Rank in his lifetime-unless events followed their original