An au based on Tartarus/Heck itself as well as the seven deadly sins, bios below.

Queen Penumbra: the ruler of Tartarus, many fear her and none try to test her, her playful personality is a disguise for her cruel nature.

Twiwraith (Pride): a prideful demonic pony who claims to be the right hand mare to the Queen, the pony of wrath thinks otherwise.

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I was messing with a calculator a while ago, and I got this:

6 to the third power times three, plus six times three equals six hundred sixty-six

Or: (6×6×6)+(6×6×6)+(6×6×6)+(6+6+6)=666

Or: 3(6×6×6)+(3×6)=666