"Sign a soul contract?"
When Sheji and Fengming heard Yi Yun's conditions, they felt bitter. Back when they forced numerous Heavenly Dao Union members to sign soul contracts, they had never expected the day of them signing soul contracts would come.
When they saw the soul contract Yi Yun produced, Sheji and Fengming's faced turned white. The soul contract was too demanding.
The soul contracts that the Heavenly Blood Union members signed prevented them from attacking the Martial Alliance or disobeying orders issued by the upper echelons of the Martial Alliance. And these orders had their restrictions, at least not ones that would directly send them to their deaths.
Although signing such a contract resulted in additional intangible restrictions, it was still an acceptable outcome.
However, the soul contract that Yi Yun gave Sheji and Fengming to sign could be said to be a soul contract between master and slave.