Erabus Prime

Erabus Prime is a planet in the Gamma Quadrant. 

While Vash was accompanying Q in the Gamma Quadrant, they visited Erabus Prime. While there, Vash was bitten by an insect although Q was able to stop the infection that would have followed. In 2369, when Vash and Q came to Deep Space 9, Q showed what would have happened had he not been with her by making her go through the stages of the Erabus disease.