Discord had escaped and planned on getting revenge by murdering luna. However his method is rather odd.
He sent her to, As he puts it: "the most dangerous ,cruel and inhospitable planet in the universe".
This planet was more commonly known as "earth".
What discord did not plan for however was the presence of a young, lonely brony living out his life one day at a time.
And when he finds and promises to help luna, discord is not amused.