The Cult Leader's Mask is one of many obtainable items in COTC.
The Cult Leader's Mask's purpose is to be burned at the Belltower Ruins or the fire inside Mall. Burning the mask will make The Cult Leader vulnerable to damage. The Cult Leader can be found roaming outside of the The Cult Leader's Church.
How to obtain
The Cult Leader's Mask can be found in a room in the Hunting Cabin.