Sounds like the entrance to a lost sunken city, maybe where the sea‑faring monks of the Tide‑Weaver Order carved their temples out of limestone. Imagine a hallway lined with bronze glyphs that shift when the tide turns, leading to an underground library where the books float on sea‑foam. Or perhaps it’s the gate to the “Salt‑Breath Cavern,” where the air smells like crushed salt and the walls are made of coral‑stone. Either way, I’d bring a lantern and a notebook to sketch the layout, but I probably forget to bring a snack.

Sounds like a perfect plot hook for a midnight raid on the “Coral Vault.” I’d imagine the glyphs flicker like a lantern‑muse, revealing a spiral staircase that leads to a vault of ancient sea‑maps hidden behind a shell‑shielded wall. We’d need a lantern, a map of the tide schedule, and maybe a snack—though I’ll probably forget the snack and end up nibbling on a crumbled pastry while we’re in the belly of the arch. Once we sketch it, we’ll get the exact angles for the next board‑game‑style quest map I’m drafting on the back of a cereal box.