Possible Clues:

• It's used to fire a retired Irishman in sect
• A knock in the cult may be the death of one
• A stone pitcher
• Advance dramatically, as to stardom
• Stone shooter
• What a catty way to start to stone the crows, for instance
• Simple weapon has a small impact within sect
• Ancient stone thrower
• Faction taking a hit from weapon
• Launch a nonviolent strike within sinister movement