[@Lucius Cypher] I have several question.
1. Where did she get her powers? You say the make then you say any similar mask will do. That makes no sense.
2. Why is she called the black beast? The description sounds more like the black blob.
3. How is the beast connected to the mask if any mask will do? 
4. The beast sort of sounds like a spin off of Slenderman. I am not sure how that will fit.
5. Why did the beast choose Arache?
6. You said the beast's weakness was the mask how can that be when any mask do?
7. What is the hunger about?