The draconic glyphs in the tunnel connecting Vozzaki's abyss to Spiremound read as...
(Investigation) the murals depict the Spiremound under attack. The info details different points on Vozzaki where it is apparent that should some devastation befall Spiremound, the people would evacuate to...
It seems in the past what was the most terrorifying thing for the ancients in Vozzaki was the, what looks to be (written here) the 4the draconic expansion. A tale long time ago of when dragons were the pinnacle Apex of the known world battling Giants and any other creatures large enough, strong enough, fast enough, to compete. It appears this third expansion war was their attempt to break into Gaimera from lands beyond. This tunnel is one of the many contingencies that they made.
It is a short history lesson as we come towards the massive marble twinset of doors. Depictions of each of the five? Six? main types of dragons, doors that look like they would be.. locked? Not trapped, but the walls - frame of the doors, is also a marble-adjacent stone, one that is far too sturdy to be dug through.