With the prototype having proven itself and Clan Skryre having developed countermeasures to how you were using it, you move on to the second prototype, which is based on a much more proven design you've heard of but not seen in person - the Drakegun, used by the Ironbreakers of Zhufbar to fire a pressurized stream of burning liquid. This variation might have been inspired by the defences of your penthouse, because instead of a combination of alchemy and precision engineering, this one uses simple plumbing and Adela's magic to fire a narrow jet of superheated steam. After the success of the previous prototype you give this one the benefit of the doubt, but considering the much smaller range of this one and the heightened alertness of the Skaven, you resolve to be significantly pickier about targets.
Several days pass with failed approaches, and Adela impresses you by not arguing with or complaining about you erring on the side of safety, and not long after you get the chance you were looking for as an unlit side-passage takes you within a stone's throw of a guard post. You take a moment to check for possible reinforcements, make sure that the sniper position behind the guard post didn't have an angle on you, and make sure your path of retreat was appropriate. You give Adela a tap on her shoulder, and she takes a deep breath, rolls her shoulders to rebalance the weight of the water tank strapped to her back, and levels something halfway between a trumpet and a rifle at the unsuspecting rats. Aqshy stirs, water hisses, and far from the silent firing of the previous prototype, this one immediately results in the mingling cacophony of the shriek of escaping steam and the screams of those exposed to it. You've seen a lot of death in battle, but it still takes some mental effort to close your ears to the screams, your nose to the smell of boiling flesh, and your heart to the new form of suffering you're helping to invent.
As Adela turns the weapon on the first Skaven to recover from surprise and charge at her, the limitations of the weapon immediately becomes clear, because the steam takes precious seconds to penetrate through fur to the flesh beneath. By the time that would-be attacker was incapacitated by agony, three more are closing. You reach out and grab Adela by a backpack, yanking her behind you and back into the narrow side-tunnel as Branulhune appears in your spare hand. The Skaven charge on regardless, only to be met by a low sweep that cleaves two of them in half at the waist. The third didn't quite manage to close the remaining distance before you had pulled back from the swing, and his momentum impales himself on the blade, screaming in pain and hatred as other Skaven close in, no doubt hoping to take advantage of your stuck weapon. Your revolver in your offhand accounts for two more, and an eager leap from another becomes doomed as Branulhune disappears from within the dying Skaven's chest and reappears in your hand in time to cleave it out of the air. You grimace as blood splatters against you, but the moment of hesitation that it gives you allows you to summon and shape Ulgu. Between one instant and the next, you go from merely intimidating to supernaturally terrifying to the remaining Skaven, an impression only reinforced as the shadow cast by the warpstone lights reaches out to latch onto the head of the nearest foe. The unfortunate Skaven thrashes in its grip, trying in vain to free itself from a force intangible to its claws but all too tangible to its face.
As the remaining Skaven flee screaming into the darkness, you reholster your revolver, dismiss Branulhune, and take a handkerchief from your pocket to wipe the blood from your face.
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The next few trials reinforce the impression the steam-thrower had made on you: fairly effective and quite terrifying, but between the range and the time it took to incapacitate, it couldn't be relied on as a front-line primary weapon. Adela manages to take out a patrol without your intervention by discarding the weapon and switching to fireballs for the last few, which pleases you and delights her, but apart from that each one requires your intervention to break the remaining Skaven, and once more she impresses you by holding her gripes until you're safely back behind Dwarven defences. Though the prototype didn't do quite as well with this second round, the loot was significantly better.