you wake up from a nightmare. You can see a tall shadow wearing a cat mask with some moth wings made of bones

Oh goodie! Your awake. I have a gift for you! they pull out a mask looking almost identical to the one they are wearing and hands it to you now wear it for too long at a time, or something bad will happen..

"What will happen?" you ask

Oh, well, soon after wearing it for more then t minutes at a time will make your vision go blurry, and soon you'll feel like you are losing your control, then you will become my servant, and stay with me and do what I say for all of eternity! Now, please put it on, for me..