How did the legendary sword Tu Su die?

He died like this: didn't he have a seal inside him? If you don't understand it, you will go crazy and become a monster. I don't understand. I died in three days. Originally, Baili Tusu wanted to wait for a god to wake up and asked him if there was any way to untie the seal, but the man named Ouyang Shaogong took Qing Xue away and forced him to find him within five days (it seems to be five days), otherwise people from several provinces in the south of the Yangtze River would become burnt together with Qing Xue (that is, they would still be alive after being eaten by insects). So Tu Su couldn't wait to fall asleep, so he untied the seal and died after playing the ultimate big BOSS Ouyang Shaogong.