The Impossible Shard – December 2, 2019

Roll credits.

Surprise! Phantomarine is… a substance!

A phosphorescent mineral/gem unique to this world, used in the lighthouses specifically to ward off seaghosts. To those who guessed this correctly, congratulations! You SMART 😀

A more common, similarly-colored mineral called Revenite exists, but its glow is not self-sustaining. Which makes it a bit less… reliable. But still handy for the commonfolk! Personal lanterns, small boat-lights, and residential lighthouses all contain Revenite. The big main Lighthouse Roads – as mandated by the church and the goddess – are all Phantomarine.

…WORLDBUILDING!