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Mythrus
From Warhammer 40k - Lexicanum
Mythrus was a Terran warrior-Goddess, that was informally worshiped by soldiers a thousand years before the Battle of Terra.[1a]
Her worshipers believed she watched over them[1b] and they secretly met in underground chapels dedicated to Mythrus. There they practiced their faith, known as the Mythraic creed,[1a] and offered thanks to the Goddess after they survived a battle[1b]. It was thought, that the worship of Mythrus had ended by the time the Emperor rose to power[1a], but some members of the Hundred and Fifth Tercio Upland Grenadiers Imperial Army Regiment still secretly worshiped her.[1b]
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