Because if you can do something, you have to, right?
When they fell from the sky and landed in a crystal pony's flowers, one couldn't be blamed for thinking that they would help usher in a new era of peace for the kingdom. Instead, they will be their downfall.
This is a continuation-slash-retelling of A Dark Undertale of Equestria, which itself is a much less friendly version of An Undertale of Equestria. The original author lacked the determination to continue, but he allowed me to finish what he started.