Suddenly, the most powerful Death God spoke: "Why don't we set a rule? We can't let Anyin resurrect for free. Each resurrection should require a certain fee. How about using demons for this fee?"
This method benefits many aspects at once. On one hand, it benefits Du You, keeping him balanced in his heart.
On the other hand, Du You can use the benefits gained to quickly enhance his comprehension of the Law. Even if the effect might be somewhat lacking, it's better than nothing. If Du You's strength improves quickly, it would greatly help them too.
Even if it doesn't work, once this battle drags on for several years, such a setup is also useful.
The third point is that setting the material cost to materials from demons will encourage everyone to hunt the Demon King. If the demons incur too many losses, they might even abandon this world and stop attacking.
