How does Wei Wuxian distinguish monsters?

For example, a living tree, stained with a century-old book fragrance, cultivated into essence, turned out consciousness and disturbed people. This is a demon. The strange thing is that if I take an axe and only cut off a dead stump, it will be refined again.

Wei Wuxian is the hero in the domestic novel The Father of the Magic Way and its derivative works. Father Wei Changze, mother hiding, handsome and unrestrained, unruly personality.

When he was young, his parents were killed by night hunting. Jiang Fengmian took him back to Yunmeng Lotus Building and accepted him as a big disciple. He lived and studied with his daughter Jiang Tired and his son Jiang Cheng. I have studied Gu Sulan's "Through these clouds, how can I tell? And met Lan's second son, Lan Wangji.

Introduction:

Wen's rampage ruined his life. The Rightists of Xianmen in Jianghu launched the "omen of shooting the sun" and joined hands to crusade against Wen. Wei Wuxian, the ancestor of Yiling, made great contributions to overthrowing Wen Zhongli, but he was afraid of being cheated because he was too powerful and unconventional.

He was reviled by thousands of people, taken to his lair by his brother, and his body was destroyed. 13 years later, Wei Wuxian died, and once again met with old friends such as Lan Wangji of Gusulan and Jiang Cheng of Yunmengjiang. The mystery of the past remains the same.