Source Gods and Magic
Aura faint abjuration; CL 3rd
This black leather mask is studded with bits of bone and metal, with smooth-sewn holes for eyes, mouth, and nostrils; it laces in the back with long straps and covers the entire face, leaving only the ears and back of the head exposed. When worn, you gain a +2 resistance bonus on Fortitude saving throws.
If Zon-Kuthon is your patron, once per day you can whisper a command word to lash out at a target within 100 feet, slashing them with an invisible blade of force for 2d4+2 points of force damage. As a free action, you can will the mask to unlace, reshape itself into a leather cap on top of your head, or hide itself within your shirt or helm.