A boy could be seen practicing. He channeled mana to different body parts through his mana veins and trained. He could feel that his body had become a lot stronger than before.
He could feel it being nourished and strengthened as he channeled mana through his body using mana veins. With time, his body was getting stronger; this change appeared after he had advanced into the Epic Stage.
When he transferred a large amount of mana through his veins, his veins expanded to some limit, causing him extreme pain before getting injured. Sometimes, they were a little away from bursting apart. It took a lot of time for them to recover.
Now he discovered that his natural regeneration worked on it as it saw them as a part of his body. He was astonished when he discovered that this discovery could help him temper his mana veins and make them bigger to allow them to transfer mana faster.