"Life-death potion?"
Isabella Lindsey's mind swiftly ran through all the knowledge she had acquired at Kyoto Academy, matching the information.
The potion indeed enabled its user to lose their sense of pain temporarily and rapidly expanded both their internal energy and muscles—yet it also came with other problems.
For example, not only the internal energy and muscles would expand, but also every single cell within the body, including the human brain.
When a person's brain receives such stimulation, it would fall into complete madness, executing the last command they received while still lucid.
To carry out this command, those who used the life-death potion could completely forget about life and death, disregarding any danger!