As the deep cold flowed through his body, Zhang Yu felt a chill enveloping him, as if every strand of his Qi-Blood was tightly locked, and the consumption of his longevity was instantly delayed by a hundredfold.
Zhang Yu quietly estimated in his heart: "I just tested the Flame Sun Technique for about 4-5 minutes, directly consuming nearly a month's worth of my lifespan."
"But if I can continuously operate the Deep Cold Magical Vein, it would take about 7 hours to extend my lifespan by a month, which makes up for the consumption caused by the Flame Sun Technique."
"In other words, for every second I use the Flame Sun Technique, I need to maintain the Deep Cold Magical Vein for about 100 seconds to balance the consumption of my lifespan."
Thinking about this, Zhang Yu nodded slightly; the existence of the Deep Cold Magical Vein greatly reduces the cost of using the Flame Sun Technique for him.
...
Kunxu, Level 16.
