Within the Obsidian Soul Stone mine, after igniting and turning the tens of thousands of Weeping Soul fruits into fuel, the Reverend had pushed his strength far beyond Ascending-God level, and could now look down on the whole Landgrave Assembly. But for this temporary strength boost that brought him to the Blood Matron's level, he paid a hefty price.
The boost only lasted one hour, so unless the Reverend consumed the Blood Matron's soul within that timeframe and broke through the final layer of the Weeping Soul Mantra—even if he somewhat escaped—he'd lose centuries of accumulation and suffer a severe setback. But by now, the Reverend could no longer see retreat as an option. The Blood Matron understood that very well.