Sakido was struck by a holy arrow during her escape from Hell with her brother Buwaro and the Jakkai Rhea Snaketail. She was suppose to die, and there is no coming back form death for demons. However another saw Sakido's act before she died and thinking she deserved another chance at life brings Sakido to Equestria and restored the damage the holy arrow caused before her life-force was completely snuffed out.

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Slightly Damned Crossover(Comic pages 1-93 Or audio play episode 1-3 )
Thanks to Mr101, Berry Punch, and Timps for Pre-Reading
One-Shotober Story #8 10/8/2013