many made up words here so lets define em babey!
St. Murmanalia - Grand, artificially floating city. Contains "levels" of islands, as if stacked upon each other. (sorry to reference sao but.....very much like steampunk aincrad)
Old Saints - St. Murmanalian term for the titans that lived on the earth before humanity.
Saint's Blood - Liquid form of the fossilized Old Saints. Most common way to refer to the metal, as it's most often used in this form.
Saint's Bone - Solid form of the fossilized Old Saints. Rarely used in this form, as it's brittle and has a low melting point.
Saint's Breath - Gas form/fumes of the fossilized Old Saints. Most common occupational threat(?), easiest way to expose oneself to its effects.
The Heart (of St. Murmanalia) - The central furnace that processes and pumps replenished Saint's Blood through the pipes across the city.
The Artery/The Spine - A huge, central pipe, that also serves as a pillar connecting all the islands together. This pipe transports saint's blood from throughout all the islands, where they disperse into little "Vein" pipes across the individual islands.
Bloodied One - Individual afflicted with Saint's Blood abilities. Can be through physical burns, inhalation of gas, or, somehow, ingestion.
Bloodrunner - More specific sub-term(?) for a bloodied one who gained their abilities by inheriting it from an ancestor. A very uncommon and rare trait to gain.(?)