We had a corrupted Luna as Nightmare Moon, we had Midnight Sparkle for a corrupted Twilight, and a corrupted Celestia for a card and a comic. But we haven’t seen a corrupted Cadance yet. Her alternate doesn’t really count since she never appeared in the comic. So being a lovehorse worshipper, I made my own
 
I would love to hear other people’s stories of how a Corrupted Cadance could happen. Expect more art of evil lovehorse.
 
What I’ve been thinking…
 
Headcannon: What if Cadance was bitter in her past? Being the only pegasus in a village of Earth ponies, she would feel outcasted. Knowing that her parents abandoned her, Cadance would feel hateful. The battle with Prismia is what teaches her to love and respect the Earth ponies for raising her.
 
Now in the modern times, King Sombra converts the Crystal Heart’s love and happiness into hatred and sorrow. This corrupts the Crystal Heart. Cadance becomes haunted by the anger and hatred she felt in the past, and this is what corrupts her.