She only wanted to be loved.  
She only wanted the attention that her sister received every day from dawn until dusk.  
All she wanted was the chance to show the ponies of Equestria that her nights are just as beautiful as the day, if not more so. Yet the constant neglect from the ponies of Equestria started to wear on her heart until the darkness that we all have overpowered her judgment. However once the darkness took hold, she couldnt go back. now she is a prisoner of her own envy, but is this really her fault, or the fault of others.
 
this took forever to do but it came out great, this will be used in a bigger project im working on.
 
Luna, Nightmare Moon & MLP:FiM Lauren Faust and Hasbro