Why Was Tiandao Sterilized?

Tianyi woke up from the void, and when Bu opened his eyes, he saw an immortal waiting in front of him. The immortal smiled and asked: I ask you, are you a human being? "No, I am not a human being, I am a son of heaven!" "Emperor, there is an invasion of evil spirits from another world, please help us protect our homeland and protect the world." "It's my responsibility!" . . . . . . A few years later, Tianyi died. Tian Er woke up from the void, and when Bu opened his eyes, he saw an immortal waiting in front of him. . . A few years later, Tian Er was killed in battle. Tian San woke up from the void, and when Bu opened his eyes, he saw an immortal waiting in front of him. . . After Tianbai was killed in battle, Tiandao finally couldn't bear it any longer, "The alien world is invading, you bastard immortals are hiding behind and doing nothing, so you can catch me and pluck me out, right? I'm going to be sterilized!!!"