Prologue: Failure

Run.
His instincts told him to run as fast as his legs would carry him. Run, get away, leave this place now.
But the unicorn stallion couldn't run. His mind was screaming a thousand thoughts, but his body was frozen. He instead stared numbly at the familiar scene before him.
"You've failed again."
That voice, that tone. Every word of it was familiar, etched into his memory.
"But this time, you won't get another chance."
Make it stop, he willed, End it now. Before he says it. Please.
"You are banished, Moonstone."
At that moment, his body unfroze. He reared, his horn slashing the air wildly as he let out a single scream.
Then Moonstone woke up.