Li Hao had already planned this out.
He had signed an agreement with the fire Phoenix Sector that he could not attack Feng Yan and the others. If he did, he would trigger the chaos lightning tribulation ... And that was exactly what Li Hao wanted. He was currently cultivating the sword of destruction, and the lightning tribulation was just right for him.
Forcing the lightning tribulation into the thousand destruction swords before killing the seventh rank venerable sovereign was also his plan.
Otherwise, he wouldn't have let these people stay around Feng Yan's side.
Moreover, when they signed the agreement, there was one more thing. Other than Feng Yan and the two seventh-level venerable sovereigns, the other venerable sovereigns in the fire Phoenix realm would trigger the lightning tribulation if they attacked Li Hao. So, Li Hao was not afraid of the many venerable sovereigns in the fire Phoenix realm.