This story is a sequel to Princess Twilight's Profoundly Peripheral Protector
Big threats were nothing new to Storm Kicker. Even before entering the service of Princess Twilight Sparkle, Storm's career had brought her head-to-head with some of the worst Equestria could offer, and more still—from water monsters in Canterlot to the changeling invasion. She knew when she agreed to be Princess Twilight Sparkle's bodyguard that it was probably only a matter of time before some new ancient evil broke loose, and she would need to be there, at her princess' side.
When Tirek began his assault on Equestria, Storm was ready to give her life in the service of princess. What she wasn't prepared for was Twilight sending her away. However, regardless of her princess' orders, Storm swore an oath to serve and protect her princess, and she will do what she must to fulfil it. Even if it means putting her life on the line in a hopeless battle against an enemy she cannot possibly defeat.