Mozgus is one of the Holy See's chief Inquisitors, known for traveling with his crew of torturers to stamp out heresy and dissent. He becomes the main antagonist of the Tower of Conviction arc, where his fanatical crusade to "cleanse" the city of St. Albion puts him directly at odds with Guts, who's trying to rescue Casca. His symbol—four torture wheels—perfectly captures his philosophy: torture is the path to salvation.
Before his posting to St. Albion, Mozgus had already built a reputation as a devoted zealot working for the Church. He gathered a small group of outcasts and disfigured people, offering them comfort by quoting Church doctrine and convincing them their wounds were God's gifts. Then he'd train them in his particular brand of torture—brutal stuff that left survivors permanently scarred, physically and otherwise.
When sent to St. Albion to root out heretics, he requested the Holy Iron Chain Knights as his personal guard. There's actually a real heretical cult operating in the mountains nearby, based around orgiastic rituals, but Mozgus barely bothers with them. Instead, he focuses almost entirely on crushing the local population's desperate resistance to Church rule—treating the hungry and poor's defiance as if it were an affront to God himself, since in his mind, he is God's instrument on earth.
He's physically imposing, relentlessly harsh with everyone including himself, and this ruthlessness impresses Farnese. He crushes rebellions through threat and terror, though he does show one moment of mercy: when a starving mother begs for food for her child, he gives the kid both meals and medical care. But the mother? He sentences her to torture anyway, offering a tearful prayer that she survives this "test" God has prepared for her—treating the whole ordeal as a teaching moment for Farnese about divine harshness.
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