In a divine war where World Secret Domains were deployed, the role a mere single god could play was extremely limited. So although the Divine Lords were surprised that Ash could summon the Heart Sword God in such a crisis, they did not really take it to heart—so what if Ash had one more god? What could that change?
In fact, that was indeed the case. With the resources currently available, even the Mirror Demon's perfect spellcasting skill could not reverse the battle. Or rather, the fact that the Mirror Demon could stand against three Divine Lords who controlled World Secret Domains was already turning decay into miracle.
It was not as if he had no World Secret Domain or Eternal Miracle. If the Mirror Demon wanted, he could take back the Ancient Battlefield from Sonia. It was just that the three Divine Lords were not three Lala Fats. No matter how stupid they were, they would not watch the Ancient Battlefield's authority transfer before their eyes, and they would definitely give Sonia special attention.
Although "Battlefield Curtain" was an absolute defense, that still depended on whose hands it was in and who the enemy was. Sonia could barely endure the Omniscient Weaver, let alone the Blood Moon Supreme Lord and the Paradise Lord. Once the Mirror Demon revealed any intention of approaching her, she would probably face her most dangerous, darkest moment.
The fact that Sonia had lasted until now was already her limit. Even Death Frenzy at the same age could not have managed this. He could not force her any further.
Moreover, Ash's request was to protect them. Although the Mirror Demon did not care about Ash's thoughts, there was no need to add variables. After all, even without a World Secret Domain, without an Eternal Miracle,