Broken Boulder Sundagger

This is it.

Acheron whirled to face @Cassius with a boyish grin, beckoning him to look about the territory with a sweeping gesture. A flat expanse, but shaded by the nearby woods — and it harbored secrets beneath its surface. Cassius was given only a few seconds to survey the land before Acheron was leading him further, toward the heart of the territory where a giant boulder sat cleaved in two.

Don't worry, there's more to it, He muttered, ducking into the yawning chasm set between the two halves. Tunnels. Little caves. Perfect, right? Perfect, at least, in the eyes of a boy-soldier sent out on his own long before he was ready. Acheron only hoped that his father would approve.