Azakana, a little demon who feeds on negative emotions, immediately attacked him. They are the devil cousins of Evelyn and Tamkenzi, but they are slightly inferior in strength. The latter shows primitive feelings such as desire and obsession, while Azakana represents more specific personal feelings: self-doubt that is constantly being eroded, fear of being forgotten, and so on.
The relationship between the two:
Azakana, who attacked Yong En, has been eyeing him for some time, and the negative emotions generated by Yong En's search for Yasuo provided him with nourishment. Yong En died before he had a good chance. When he came to the spirit world, he challenged Yong En and tried to devour his soul. In the end, Yong En defeated him (at least he thought so), but the cost was quite heavy.
Yong En woke up and found himself in this world, with a mask firmly attached to his face-that was the image of Azakana he had just defeated, and the devil was sealed here. But Yong En didn't lose his mind. At least he knows that he is not at the mercy of Azakana. Unlike Cain and LaAstor, there is no connection between them. But this does not mean that Yong En has not gained the strength of Azakana.
Baidu Encyclopedia-Seal the Soul of the Magic Sword
Reference to the above content: Baidu Encyclopedia-Azakana