Commission for a good friend, the following is a little blurb for the pic they wrote.
 
 
“Those who crave peace should prepare for war. Celestia has been an advocate for friendship and peace for hundreds of years, always looking for the most non-violent soluation, no matter how bad things might have seemed. Yet, every dam has its own breaking point, and so too did Celestia’s good graces. This was the final time Celestia was going to let Equestria be pushed around. Thanks to armor crafted by her own pupil, she was now able to go deal with the threats that could not be befriended or talked down. Celestia craved peace above all else, and now she was ready for war.”