(Yet another alt-timeline idea for Crucible Spark, in which he is capable of travelling through universes instead of ending up in Twilight's castle and decides to... um... cleanse the Ponyverse of its darker side... I guess.)

He realized his gift.
He realized the opportunity before him.
He realized his purpose.
...

"In the name of Harmony, I serve."

Spark travels to darker AU-s and "fixes" them according to his belief of what "True Harmony" should be.
Which meant going on a crusade through Equestrias that follow darker fanfic tropes.

On the bright side, at least a bunch of Sunsets from various universes are now a lot safer from getting harmed!

Cover art by Rocket-LawnChair