Cause to Live by Akinasky
After the final battle, the rebels are given a choice by a mysterious man: move on to the afterlife or live once again and help him and his people fight a battle of their own.
This is a really interesting premise that I'm enjoying. Seeing the rebels reunite with their friends and lovers, all the while preparing for another, possibly even more dangerous battle, kept me glued to my screen. Check it out!
picture edit: apocryphalaffection