Time.
Time is what you need, it is such a prolonged quickness. We need time to heal, we need time to die.
Time will free us from its own prisons. All things are temporary. Even Death.
Prologue
A comedic start for a serious story, if you don't like the prologue I still encourage that you give the other chapters a chance.
Light or Flight
Where the seriousness begins. Scootaloo wakes to find herself in the caverns, trying to figure out what is going on.
In The Dust
Scootaloo explores. Different Perspective introduced.
Perdition
Introduction to the city.
Grieving
Just a side part of the story that shows that her disappearance is affecting others.