Not sure where this came from but here is an idea I had when I was looking at Tori's "stanger" word of the week while listening to VRE_H's Beyond the Wall.

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Beyond this forty foot concrete wall
Impenetrable, impervious, unpiercable
Built by the most gifted of dungeon designers
Laid a new world

Inside this forty foot concrete wall
Dry, desolate, deserted
The remnants of the old world lay wasted
And left to shrivel up in the darkest corners
Lived a heinous creature

Imprisoned between these dungeon walls
Silent, shadowy, still
The creature footed its way round
Round and round around the walls
Greedily sniffing the sweet air
Gushing through from the littlest cracks

On moonless nights when all is dark
Gloomy, cloudy, foggy and grim
The creature could be heard
Banging the walls with its horned crest
Determined on its conquest to break free
Break the walls and set its teeth
On the ones who put it there

One day, a stranger passed by
Cautious, curious, courageous
He heard a story in a local tavern
About the old beast within the wall
Trapped for more than a century
Its wrath built up to the point of explosion

That night, as the clock stroke three
Once, twice, and a third time
The stranger sneaked out of his bed
Hid his sword under his cloak
And ran towards the wall

He climbed up the iron rungs embedded there
Still strong after years of winds and storms
When he reached the top, he stood

There, among the shadows
Mean, menacing, mindless
The creature let out a snarl
The stranger unsheathed his sword
And jumped into the pit

None knew what became of the stranger
Nor that of the beast
The banging has since ceased
But on moonless, starless nights
Sometimes
A snarl could be heard
When the wind blew
From beyond the wall