"With the price of the treasure taken into account, ten percent less than an already made water sphere."
What Daniel meant by that, was that taken the price of the essence treasure out of the cost of an essence sphere, he would make people pay the difference ten percent less.
This might not sound much as a discount, but for people that, in order to find someone that could create such a high level sphere, was already extremely difficult, ten percent was already a lot.
After all, people who were adept in specific types of essence were parts of sects or groups to which that essence was needed the most.
In fact, some sects had even formed around a single cultivator's knowledge about essence.
For example, the Sect of the Illusory Edge had formed around its founder's comprehension of light essence, which had created their style of swordsmanship, and had formed a sect around its use.