The Cave Illuminator is a tile entity added by Astral Sorcery. When placed below the night sky without any obstructions, it will create transparent Illumination Powder blocks in a wide area below it. New ones will be generated if new dark areas are created.
Using the illuminating properties of the powder made from Glowstone and Aquamarine, it was only a matter of time until a device that takes advantage of these properties on a massive scale could be created. It drastically amplifies and focuses the sparks emitted by the Glowstone and Aquamarine using Rock Crystals, shaping them into small yellow-colored flares that can remain lit indefinitely. These flares can pass through solid objects and repel each other, allowing them to space themselves evenly as they form.
The Cave Illuminator forms these flares in any lightless [sic] and open space located beneath the device itself. Meaning, that it can illuminate deeply buried tunnels while sitting on the surface. The process of formation is slow, but its radius extends an impressive distance from the main device. The Cave Illuminator also adapts to newly formed empty spaces made by mining and building, making it indispensable to avid spelunkers and miners. The Cave Illuminator requires a visible night sky to work.