Welcome to the board, Qiote!!!
How frustrating!
The best solutions are to reload a previous save or hack the item or hack the mask (I do have the item code for the Masque of Evil). Hacking an item isn't that difficult there are just a few simple rules you have to follow (such as back up your file to another directory!). Also vanishing into the Mavin room would work as well.
Let us know which route you decide to take!
Wyv
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