The City of Light, home of the curia, a city entirely composed of the disciples, worshippers, and various institutions of the Church. Despite its population of only a hundred thousand, it remains the Holy Land in the hearts of all Disciples of Light across the entire plane of existence.
Anthony had control over the Eastern and Western Diocese, with the ability to mobilize hundreds of thousands of troops, outnumbering the total population of the City of Light. However, he had no desire to conquer the city.
Firstly, the City of Light is viewed as a sacred place by the followers. Any attack on it, regardless of the reasons, would provoke their hostility.
Secondly, the city is a vast fortress. It is built into the side of a mountain, with essential facilities constructed directly into the hollowed-out mountainside. The city features the Wall of Sighs, dozens of Soul Towers, and numerous Towers of Holy Light.