Well Bronyvamp and Raddum can't vote b/c it's their ideas. Rouge refuses to vote b/c he sucks. That leaves Brat.
We ponies live in the UnderCloud, as described by Raddum. Years ago, the UnderCloud was a beautiful land, until one day, a cruel Overlord (of any species) slaughtered the king of the lands, plunging the lands into a deep depression. This goes on for years until finally, some pony gets sick of being pushed around by the Overlords minions and guards, and decides to make a stand. After much research, said pony discovers that the only way to vanquish the evil Overlord is to collect some sort of jewels/gems that, when placed inside a sacred tiara, grants the wearer immunity to the Overlords powers and the ability to vanquish him to some sort of hell. So the rebelious pony first has to rally together ponies who would be willing to fight back, and then they set on their epic quest to find everything. On their way, they are attacked by various, villainous minions of the Overlord, and must stand together to fight their way through, possibly meeting other ponies on the way.
BAM. All three of y'alls ideas merged into one. I should get an award.