The Forgotten Beast Asngek Dakdorku came. I was told to beware its poisonous vapors.
That'll teach me.
A flying eyeless snakefly, Asngek swiftly traversed the caverns making a b-line for the opening to my fortress.
As per my usual fortress design, I guarded this particular entrance to Ginetdodok, or "Crewclasped", by having the entrance open on to a barracks. A barracks that just so happened to be populated by 9 legendary hammerdwarves. I also chose my least experienced squad to kill Asngek, a smaller squad of three, bringing the force that were to meet Asngek to a total of 12 legendary warriors.
The fight itself was a trivial matter, with Asngek dying swiftly to a mighty blow from Datan Onululter Ekzongruthosh's silver warhammer that sheared the beast's thorax from its body. In exaltation, Datan bestowed the name Serkibbonun (Randomsoot) upon his trusty thumper.
But with its dying breath, Asngek loosed its foul vapors upon seven unfortunate warriors, Datan amongst them.
Immediately the afflicted felt the dread effects of this noxious cloud, their eyes swelling up, accompanied by a strong fever and localised numbness.
They made a dash for the hospital, some 10 floors above, but alas, were never to reach it.
Their eyes rotted out of their sockets on the way, leaving a foul miasma in their wake. The martyrs managed 7 or 8 more steps before succumbing to rapid blood-loss.
Upon hearing of the demise of his friend Datan, the mayor, Morul Logemmesir, began throwing things. With no-one to talk to, even the fortress waterfall was not enough to calm his rage. In a fit of pique, he ran to his office and promptly destroyed his masterwork throne, then began complaining in a loud voice that he had no office suitable for his position.
The captain of the fortress guard, Thob Losisoslan Korodshith Tizen, who had lost the majority of his squad to the dread cloud was having none of this and promptly locked the mayor away for 25 days.
Seizing the opportunity for a good moan to a captive audience, the spinner Zulban Keskalidash proceeded to drone away at the mayor in her drab monotone about the general stinkiness of miasma, how that big fiery ball in the sky gave her migraines and just how uncomfortably damp rain made her.
Somehow, such bureaucratic punishment seems well deserved.