In this chapter, we learn that the south phoenix demon clan is the most powerful clan in the demon world, and the only one that can destroy the enemy. The south phoenix clan has a powerful weapon, the "Genuine phoenix sword," which can destroy an enemy's soul if it is in danger of being killed. The only reason that Lu chen doesn't want to kill the master of the south-phoenix clan is because he fears that killing the master will cause his holy sense to detect the presence of the enemy and summon his soul to burn the enemy to ashes. In other words, if he kills the master, the master's "holy sense" will detect that the enemy is a holy person and summon the power of the holy person to destroy him. If the master is killed, the holy soul will be summoned and the enemy will be destroyed. The two of them have a complicated relationship, which is why they don't like each other. They need to get over it.