Slasher-mask-hunger ?

I created a story for a boss-like villain.

To make a long story VERY short, they guy who is physically imposing has some minor mental illness due to stress, and some latent psychic ability that are partially awakened due to some trauma in the past.

One day, The D day, where he does a real bad mental breakdow, he came to be in the possession of a "supernatural" mask... and becomes a slasher mask type.  Both the mask in association with the now, turned inward, latent psychic ability, makes him that way... a dangerous mask-slasher.

Then it occured to me...

Lets make more of that...  He kills, and eat.

In the antagonist book they have a creature called the hunger...

I know that basicaly, its not within the rule to mix the big supernatural template, but ive seen psychic awakened ghoul and stuff like that in the past since those are not in the "big league" of the principal supernatural template.

I still don't know if mixing the Mask template with the Hunger template is something doable.

In my world it is... but in yours ? 
What do you think ?
Why do you think it ?

Some feedback might be appreciated.
thanks

It doesn't need to be playable (and by definition, in any way fair) to be an opponent in a game. For example, in the two nWoD games which I've played, in each case, the final opposition was against something not less powerful than a god. In the first instance, I was a weak Mage, in the current, I am a squishy Hunter. If you want to put it against your players, do it. Don't explain it, just figure out what makes it tick, figure out what can kill it, and let 'er rip. If you want your Mask to have shark-teeth and a sweet-tooth for human headcheese, what's stopping you? In fact, I dare say the two concepts dovetail together very nicely.