One-tailed actually knew the source of this power. She knew that a vast number of the Demon Race in the Spirit Fruit Forest were developing faith in her. However, she didn't quite understand why such a power existed; she simply accepted it in silence.
In the Early Stage, this faith was still quite weak. The Spirit Fruit Forest had an immense population, incomparable to anywhere else in the world, yet the power that actually converged upon One-tailed was minuscule.
If the Power of Faith harvested previously in Celestial Wolf City was a great river, then the current source from the Spirit Fruit Forest was merely an intermittent trickle. The difference in magnitude was simply night and day.
Why was this the case?
