That's the thing, 

Pretty much the only one kf my characters I can see succeeding to take the mask away from him is Phoebe, and that's only because of her vines. Kalinda might be able to do it with her telekenisis but I imagine not. 

It just seems with what I know of the mask that's it's too over powered, even in a weakened state. What you have stated isn't so much of a weakness as it is simple a...decrease in power but not abilities. Being able to do what the mask can do just like that seems...unfair. Most of our characters struggle with working out how to use their powers and creating ways of doing so. How will the mask do that? 

I'm Not trying to be the mean parent who says no. I'm Just trying to prevent God modeling and over power meant, considering that when you come in, you will literally be new and therefors won't be able to do much-that's how we have all worked with oue characters. But with the mask I iust don't see that happening unless you can come up with a barrier or something that prevents full use of his powers.