Celestia is a living goddess and savior of the Equestrian ponies. A being of immense power and bravery no creature has yet matched; power even her sister could never hope to achieve. Their story has always been told as the coming of age tale, two little fillies rising up to overthrow the chaos that plagued their home. Later it was learned the tree of harmony gave the sisters their strength to finally stop Discord, but even Luna admits they waited a bit before confronting the beast.
Luna waited near the tree, while Celestia left in search for the one place even the lord the of chaos refuses to mess with. The one place with enough fire and deamons for a creature of legend to call home away from home.
Tartarus.
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Credit for the WOW cover art goes to xzendor7
Living Saints have a hell of a healing factor, and can resurrect themselves. They are brought back post-mortem by the Emperor after all, makes sense they would have super powers. Also, they are technically daemons, the same way that a Prince of Chaos is a daemon, only in service to Order. Both have been elevated to immortality by a Warp Entity, and can return to life regardless of wounds. Saints are no longer human, contrary to Imperial belief, and the misconception that they are is just another interesting little hypocritical quirk of Ecclesiarchal doctrine.
Anyway, good story. I would actually like to see more of this, maybe our Saint friend makes a return to purge some zenos. Or perhaps she is recovered by the Imperium? That would be interesting.
In the short description there is one hell of a spelling error... mentioned.
5691257 Fixed. I don't know what I was on when that was typed, and for that I'm happy there are people out there with a clearer head than mine. :)