Dawn of the Final Day

"My grip is weakening. I can't push you any further. It's time, isn't it?"

...

"I had... hoped for a little more time. I wanted you to make it to sunset, more than anything. Was that selfish of me?"

...

"I know. You've held on long enough. This is my fault."

...

"No, I pushed you too much. I just wanted one last day of normalcy. You deserved better than this."

...

"You deserved better than me."

Scene 1

Flashback

Scene 2 - In which Celestia discusses the futility of what ifs with Equestria's first successful doomsayer