I ran a Krevborna one-shot based on the adventure "Tockworth's Clockworks" in the D&D book Keys from the Golden Vault. Here's how it went:
Characters
Angelique, polnezna spirit medium
Damir, highwayman
"Father" Severin, defrocked priest
Lady Jeanette, knight
Fanlin, forest elf thief
Events
The characters were all in the employ of Sir Aubrek Salazar, one of the foremost military strategists in Krevborna. Sir Aubrek was currently acting as an advisor to one side of the Hellwar–the war between factions of devils that has spilled out in the Mortal World, causing chaos and destruction throughout the land. Sir Aubrek commissioned the dwarves of Lagh Farran, a town in the Karthax Mountains, to craft weapons and armor for the military leader he currently serves. The problem was that the armaments were now overdue, with no word from the dwarves of Lagh Farran. As such, Sir Aubrek sent the characters to Lagh Farran to resolve whatever impasse was keeping his weapons from being delivered.
In the earliest days of spring, they trekked through the mud churned up by the near-endless downpour of spring rain and climbed the steep mountain path to Lagh Farran. Lagh Farran consisted of an overtown (built atop the mountain) and an undertown (burrowed into the mountain itself). As they approached, they saw the overtown hosting more tents that they expected.
After inquiring after the chieftess of Lagh Farran, they were brought before a dwarven woman named Braitha Bragg, who had set up a makeshift headquarters inside the overtown's general store. She explained that Sir Aubrek's weapons were late in arriving because the dwarves had been chased out of the undertown when the vlaakish automatons they used as part of their mining operation went berserk. Braitha pinned the automaton revolt on their Iron Speaker, Torgh Taxus, who had apparently gone insane and had been experimenting with adding ancient vlaak technology to his body. With each piece of alien technology, he became colder and crueler, losing something of himself in the process.
Braitha told them that Torgh had a key that would trigger the kill switch to shut off all the automatons. If the characters diffused the automaton threat, the dwarves could retake the undertown and send them on their way with Sir Aubrek's weapons.
After being led to the stout iron doors that sealed the undertown off from the world topside, they arranged for seven knocks to be the signal that they were ready to have the doors opened again. Down below, they found that Lagh Farran's undertown consisted of several "islands" that projected above a lake of magma that the dwarves used in their forging operation. The islands were connected by draw bridges, but some of them had been raised. A slagline--a chain and bucket system that moved counterclockwise--also connected some of the islands.
Their path took them to the island of Old Lagh, where they saw several dead members of the dwarven militia. Traversing through the undertown meant sneaking around, trying to avoid the "watchdog" automatons that flew overhead. Of course, as the characters crossed the bridge onto Halfway Isle, they were spotted and an alarm went up. They ducked into the Hall of Ancestors, which proved to be a place of worship for the dwarves; it was decorated with statues of their honored dead clan leaders.
Unfortunately, they had been followed by a "prowler" automaton, which battered the door down and came in looking for them. Although they tried to hide behind the dwarven statues, it spotted a member of the party and they were forced to battle it. Luckily, Lady Jeanette was able to decapitate the metal laborer. However, as the automaton fell, a gobkin and his tall, furry companion bolted from their hiding place in the Hall of Ancestors with a tied-up dwarven captive in tow.
Lady Jeanette threw the automaton's head at the gobkin, momentarily stunning him. The dwarf turned on his captive, kicking at his shins. Damir attempted to wrestle the gobkin into submission, but despite his small size the gob proved uncannily scrappy. His furred companion drew a flail from his belt, but Fanlin put him down with an arrow. ("Yazzo's dead!" cried the gobkin.) Angelique dragged the dwarf away and the gobkin was knocked to the ground. Sensing that he had no good way out of this situation, the gobkin surrendered.
The dwarf was untied and told them that he was Stone Speaker Kazador. The gobkin introduced himself as Slink, and he made a deal with the characters: in return for helping them sneak through the undertown, they'd help him escape once topside. Slink took an especial liking to Father Severin. "Yazzo's in the past; the padre's the future!" he proclaimed. Slink immediately proved his worth by scouting ahead and showing the group how to move more stealthily through the undertown; he even managed to pull Father Severin to safety before an automaton could spot him when he stumbled over a loose cobblestone.
They located a control room for the bridges and slagline, but the control panel was currently inoperable because one of the station's turbines had been tipped onto an automaton, trapping it. The automaton was disabled from a distance when Damir shot it with his pistol, then they righted the turbine and fixed its connection to the eldritch machinery. They then debated for a long time over which bridges should be lowered and if the slagline's route should be reversed.
Crossing into Smelt-Town, they found Torgh Taxus drinking by himself in a tavern--just as Slink had told them he would be. He was talking to himself, saying crazy things about how the Spirit of the Machine was talking to him and he didn't want to follow its dictates. The alterations to his body were disturbingly evident; one of his arms had been replaced by a mechanical limb, one of his eyes glowed red, and machinery was shifting and whirring under his clothes. The characters approached him cautiously, but he didn't seem to mind their presence initially. He even let slip that the key to the kill switch was up on the third floor of his workshop. His demeanor suddenly shifted and he attacked the group. Lady Jeanette damaged him so badly with her greatsword that he barreled out a window and, wreathed in arcane flame, flew off to seek shelter in the citadel.
The characters ran to his workshop--the front door of which was guarded by a massive automaton holding a double-headed axe. They hatched a plan: Fanlin and Slink would hide themselves near the edge of Smelt-Town with a slack rope between them; Father Severin then taunted the automaton into chasing him; at the last moment, Severin juked to the side, and Fanlin and Slink raised the rope, tripping the automaton and sending it into the lake of magma.
Meanwhile, with the way now clear, Angelique, Lady Jeanette, and Damir entered the workshop--where they were immediately set upon by two worker automatons armed with wrenches who dealt them some pretty serious blows. Angelique ran up the stairs to the second floor while Damir and Lady Jeanette held them off. Angelique examined an occult vlaak symbol on the floor and...her mind was immediately invaded by the Spirit of the Machine, which screamed in her head in a language she couldn't understand.
Damir broke away from the fight and scurried up to the third floor, where he began tossing the room looking for the kill switch key. Behind a painting, he found a wall safe--but had to wait until Fanlin made his way inside the workshop for it to be opened because Fanlin was the only one with the necessary criminal skills. Inside the safe was a jewelry box and a key to the kill switch. Once inserted and turned, all the automatons became inert and the Spirit of the Machine was banished from Angelique's mind.
They located Sir Aubrek's weapons and armor in the dwarven warehouse. They also thought they encountered a talking drill-truck of vlaakish design, but actually they were speaking to dwarf miner who had Killdozer'd himself inside it. They hooked the wagon loads of weapons up to the drill truck and had the driver head out to the overtown. (Slink was hidden under a pile of swords in one of the wagons.) Thus, they emerged as the saviors of Lagh Farran and had secured Sir Aubrek's armaments for the Hellwar.

















