As for whether the Illusionary Divine Butterflies would be affected by the Law of Misfortune, Su Yang had no worries at all.
Having lived on the highest mountain for a long time, even if the Illusionary Divine Butterflies were contaminated by the Law of Misfortune, returning to the highest mountain would dissipate the negative effects.
[...]
...
[You have obtained a killing effect.]
...
[You have accumulated 100,000 layers of killing effect.]
...
After hundreds of thousands of years of evolution, the Law of Misfortune had gradually accumulated, and the number of spirits of Misfortune in this place had reached a terrifying level.
Su Yang effortlessly stacked 100,000 layers of killing effect.
He didn't need to exert much effort and easily killed 100,000 spirits of misfortune.
If it were any other expert, even a being at the ancestor level, they wouldn't be able to do it as easily as Su Yang.