(I don't know how to label this so I put adventure and comedy as tags. Pic is Grim reaper commission by n deed-d5ivirq. What a weird name.

I also know that this concept has usually been overused, but the idea is partly inspired by Rebirth of The-Pony-Librarian)

Twilight Sparkle has been stricken with grief since her friends passed away so long ago and has been longing to get them back. To her regret and remorse, they have yet to reincarnate anywhere, leaving their old rainbow keys grayed and dormant. Only Twilight's has not been covered with dust and cobwebs.

After searching through ancient catacombs for lost magic, she comes across a particular tomb that would allow her to cheat death and bring her friends back at the cost of eleventh months of her own well-being. But there are consequences to defying death, and who better to explain them than the Grim Reaper itself?