Oversea Bastion

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Oversea Bastion is a fortification at the heart of the city of Oversea, in the western Zeemarch of Bastonia. This is the formal seat of both the County of Oversea and the Duchy of Zeemarch. The fortification is directly above Oversea's Lower City, and its magical suspension is said to have been the work of the Bastonian Great Saint of Ars Magica, San Sylvester, who levitated the castle to avoid it falling into the sea when the cliffs beneath it collapsed in a storm.