The sacrificed children's skulls.
When Jade was tripping and the monsters tried to bury him in that tomb near the stones, he saw the remains of the children’s skeletons. It was showing him the mechanism of the ritual. The monsters might have been reenacting the burial. When he wakes up from his trip, he says he knows how to save the children.
The children’s deaths might be the anchor of the curse.
Their remains are the tether.
Their suffering is the energy source.
In the same episode, Marielle says that even after death they are trapped here, suffering through eternity, and the ancient entity is feeding on their suffering. So this all means something.
This matches everything we have seen: The monsters’ strange, puppet-like behavior. The way they mimic human emotions but do not feel them. The way they seem trapped in routines. The way they appear almost mournful when they are not hunting.
The children’s deaths created the curse. The children’s suffering sustains the curse. The children’s remains anchor the curse. The entire system is built on a broken ritual involving children.
The ancient entity feeds on the emotional energy of fear, grief, sacrifice, and eternal suffering.
Jade saw the burial, the monsters reenacting the original sin. He was shown the truth.
So, when he says he knows how to save the children, he is not being dramatic.
Suffering is the currency.
Children are the leverage.
The dead are the fuel.
The entity is the consumer.
The town is the machine.
And every cycle repeats because the original sin was never undone.
I'm still not entirely sure what to make with any of this or how this would help them get out. But I think this is what fromville is about.