When Zhang Tie killed Versatile Demon Emperor in Deities Plain, Zhang Tie had already acquired Tadpole Runes Sutra. Until now, Zhang Tie's state still told him that he could only gradually recover despite with Tadpole Runes Sutra. His current state was actually much worse than that in others' eyes.
To a certain degree, everything in this world complied with the law of cause and effect or the principle of equivalent exchange.
The law or the principle was suitable for energy exchange, individual achievements, trade, life for life and the development of a country or a society. If one wanted to acquire great strength in a short period of time, he had to pay a high price for that.
