In this case, Legion rented two rank 4 divine flesh of the pathway of fate weaver. There is one in their Web Hammer and another lying about because their slaves failed.
They are returning the extra one and paying the legend another 5% in charges. In exchange, they don't have to pay 1,600 gold coins for the divine flesh. All they paid was 320 gold coins.
160 gold coins went to the legend, and the other 160 gold coins went to the seller. Legion saved 1,280 gold coins while the seller earned 160 gold coins and still had their divine flesh. So every party is happy about this transaction.
After doing it, Legion bought the rank 5 divine flesh of the pathway of killing.
The advancement requirement for rank 5 killing is to cause a lot of indirect damage to people. They had met this advancement requirement of this pathway some time ago when they used the Golden Hammer gang to kill people for them.