Avatar Diamond Tiara has suffered her first real victory, and in many ways her greatest defeat. Now she finds herself struggling to cope with the realization that she needs far more help than she ever thought. So she must turn to her old lives and, more importantly, Twilight. Together with her friends, can she discover what happened to her previous incarnation and, more importantly, the origins of the Elements of Harmony?

Image by Silfoe again. Thankies. :) Probably best one so far.
Special thanks to Angel_Bunny for editing the chapters for me.
Please enjoy!

Full collection:
Avatar the Last Alicorn:
Book 1.
Book 2.
Book 3.
Book 4.

Legend of Diamond Tiara:
Book 1.
Book 2.
Book 3.
Book 4.

Disclaimer: "Avatar: the Last Airbender" and all associated characters, storylines, and materials belong to Nickelodeon and were created by Bryan Konietzko and Michael Dante DiMartino.
My little pony: Friendship is magic and all associated characters, storylines, and materials belong to Hasbro, and was made incredibly awesome by Lauren Faust.