( This is a story set post Princess twilight, but before the elements are lost.)
Equestria Is facing an enemy like no other, violent monsters are appearing across the entire kingdom. The Equestrian guards are overwhelmed and unprepared to face such a threat, They need help. To fight this evil, The princesses will summon three beings from where these monsters are from to help them.

Through struggles both personal and external, will this be enough to save Equestria from the horrors of war? Equestria and its heroes will need to change, because as everyone knows, War never changes.