Back when he was searching for the pit fiend, he had barged into the underground Temple of Death and accidentally activated artificial death in the secret chamber of the priests 'coffins.
After Mystra's Rose Cross intervened in the temple's investigation, the artificial death disappeared without a trace.
Then, because of artificial death, the land of the sleeping, which contained countless undead creatures, and the land of the executioners, which was the death God's demiplane, merged together and trapped Wang Ningwei and asvich. It also allowed Zhao Xu to obtain the death God's divine persona fragment.
this was the only time he had used a lifestone.
Zhao Xu started to understand that in his previous life, artificial death had never woken up until the very end.
That was why there was no trace of it in the desolate Wildlands, a place where countless people from Earth had died.
