Over the last millennium, your master 
became corrupted by his piece of the 
spectrum. His soul twisted by madness,
he is attempting to enslave humanity. 
Celestia sensed this and battled him almost 
to a standstill. Celestia's physical form
has been temporarily banished from this 
plane, but your master is gravely weakened,
and she needs you to finish defeating him 
and rescue the chaos prism shard.