All right, just to get this all started, I wrote up a potential beginning to our ending. We can discuss it later.
The fortress was already in shambles. The dwarves went about their daily lives, doing no work and contributing absolutely nothing to the already crumbling fortress in which they lived. Nevertheless, the old penal colony still maintained some vague semblance of order within its halls and it seemed as if their society would simply make a gradual disappearance. The future, however, is often unpredictable, and not all fortresses are as they seem.
The year two-hundred-sixty-two had just begun when one member of society decided that there was no further need for the continuing existance of Steelhold. He did, afterall, have more important matters to attend to, and Steelhold was just a single step in his master plan; therefore, he decided that he would move on to his next step. Making his way down to the lowest depths of the fortress, he proceeded down a flight of stairs which lead right through a tunnel of warm, blue ore. He found himself in an impressive structure composed of silver -- comfortable, though comfort was not his goal in this instance. He came up to a great drawbridge, and with a mighty push, managed to let it fall down before him, opening the fortress to the world of the demons.
The dwarf stepped out of the tower and called out into the darkness: "Brothers! The moment of our triumph is nearing fast!"
The dwarf stepped into the light of the fires, allowing himself to be seen by the many eyes of the damned. He was a young dwarf, though he stood tall and had an aura of nobility to him. As the devils bagan to gather, he swept a bow and removed his hat. "I must introduce myself now. My name is James Joyce Esq. -- also known as 'Corley.'"
I say that a simple tantrum spiral is too normal for this fort. We need a long ending, and preferably one that takes down half of the fortress' structure with it.