User blog comment:Frozen Scorpio/My Votes For the SFW Summer Awards 2015/@comment-4988763-20150722033534

There's never enough backstory.

To answer some of your understandable nitpicks about the Twilight Shard, like mentioned in the text, I should emphasize the fact that it was not merely a dark artifact but an independent sentient being that caused destruction on its own in the past (hence the reason it was considered a deity on the cult based on it).

Also, considering its origins (sudden mixing of negative Chaos energy and the populance's darkest emotions) you could say the seven Chaos Emeralds are its positive (light) counterpart, hence the reason the only one able to stand evenly against the Twilight Shard was the ancient hero that used all seven of them to fight and ultimately defeat it.