When someone is offered to take you somewhere that doesn't exist will you go?
If the one who offered the deal was an idea of your's would that change your mind?
A brony had both of these happen to him and he accepted.
He tried to lessen any damage he could cause by removing some of his memories but Discord had other ideas.
Not only that but a darkness starts to stir upon his arrival and Celestia feels it but does not know what causes it.
Is the new arrival the bringer of the darkness or is he the only thing that can stop it?

Fortuna accessi tua gracia