All mortals wished to transcend the limits of mortals. That wasn't just an increase in strength... It was also raising one's life to a higher level. Whether it was their instincts or their thoughts, they all chased that goal.
Especially a magic race like the Dark Elves. Their attraction towards magic was like an addiction, and the pursuit of Extraordinary Power was an instinct of their bloodline.
Two hundred years for a Heaven Rank Dark Elf was like a year of work for an ordinary person.
A generous reward for a short duration job... No one could refuse it. In human kingdoms, Archmages could advance to the Heaven Rank, but advancing in only a year or two… Even powerhouses like Star Sage Jouyi, who was already half a step into the Heaven Rank, might not be able to resist the temptation.