I honestly love this idea. I've read every iteration of this RP and this seems to be one of the few original ideas that hasn't been overpowered. 

[@KatherinWinter]
Now I might be wrong in my interpretation of this, but the connection of the mask to the beast seems like a watered down version of my character's totem, so to speak. The Djinn aren't physical beings, they're spiritual creatures that use a totem to focus their energies into a corporeal form. They can change what item is the totem at will, but if you destroy the item that is acting as the totem, their energies very painfully disperse. That's when the ritual becomes necessary to bring a Djinn back. 

With the beast however, if the current mask is destroyed, it retreats back in Arachne until another mask matching its idea of a face is found. 


Edit: This isn't me trying to undermine the GM's authority or anything, I was just impressed by the concept and had to give praise where I think it's due