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A Warrior Boss found in the Cathedral of Flames during Warband of Brothers, he can be first found patrolling outside the room where Seer Fiercereign is being kept (on the first dungeon level). They are also found as level 20s (non-bosses) in The Flight North, Gwen's Story.
Charr Prison Guards will drop a Prison Key each time they are killed, so it is possible to acquire multiple keys if they are revived. Unfortunately, keys expire between floors, so this has no practical usage.