skygiants

The WWX inventing necromancy sounded weird to me, so I looked for it in my reread.

Chapter 72: "After the Sunshot Campaign, the criticism of Wei WuXian cultivating the ghoul path that the sects had once veiled began to rise."

It's not new. The older generation has reasons for reacting so horrified by it (other than its generally horrifying nature). And LWJ's comments about its effects are not extrapolations but based on previously collected data.