Corvus

No one knows exactly what Corvus is or where it came from. As the twilight engulfed the kingdom, it just appeared, sweeping the countryside like a plague. The only effective way to keep it at a distance is by keeping lights up around your house.

Once people figured that out, Corvus disappeared for a long time. Most started to believe they managed to fend off the plague completely.

During this time Corvus had met a special type of doctor. One they call a plague doctor, and his job is to stop the spread and heal those infected. But this doctor was different. There was this malicious shine in his eyes.

As Corvus learned of his true intentions of killing patients to take their valuables, they decided to team up, allowing Corvus to enter any house, no matter how lit up the rooms were.