D&D 5th: Demon Tower of Madness
The Two united, in the past, a Place to build, and spells to cast.
Their power grew, and took the land and people round, as they had planned.
A key without a lock they made of gold and gems, and overlaid with spells, a tool for men to wield to force the powers of Good to yield.
But armies came, their weapons bared, while evil was yet unprepared.
The Hart was followed by the Crowns and Moon, and people of the towns.
The Two were split; one got away but She, when came the judgment day, did break the key, and sent the rocks to boxes four, with magic locks.
In doing so, She fell behind as He escaped. She was confined among Her own; her very lair became her prison and despair.
The Place was ruined, torn apart and left with chains around the heart of evil power—but the key was never found in the debris.
He knows not where She dwells today.
She set the minions’ path, the way
To lift Her Temple high again With tools of flesh, with mortal men.
Many now have gone to die in water, flame, in earth, or sky.
They did not bear the key of old that must be found—the orb of gold.
Beware, my friend, for you shall fall unless you have the where with all to find and search the boxes four and then escape forevermore.
But with the key, you might succeed in throwing down Her power and greed.
Destroy the key when you are done and then rejoice, the battle won.
Found in The Pool Chamber: Area 216