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Advance warning: this work of fiction contains graphic depictions of violence and gore, including the destruction of male genitalia and various internal organs. If you do not wish to read about this or it would be illegal for you to view such material, please turn back now.

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The murk of the lowland swamp stretched on for many kilometers. Its boggy waters ran unexpectedly deep and were polluted by a curious brown fluid that did not have the same texture as mud.

The chemical sensors in Unit D's feet could not identify this brown fluid; it was every bit as foreign as the juices inside the horse had been. Likewise, some of the deepest parts of the mire came up past even the giant robot's waist, which all but guaranteed that the bog was not of natural formation.

All of this seemed to suggest that a primal either currently lurked here or had done so in the recent past. With that in mind, Unit D moved forward in a state of cautious alert.

Yet there were no animals in sight, and the waters of the bog seemed still and inscrutable. The fluid in the water had apparently either driven away or poisoned most of the usual wildlife, as not even rodents crawled around the area.

Unbeknownst to the golem, however, one very large piece of wildlife was already approaching its position. Slinking along through the brown liquid and among dead or dying trees, he weaved a massive path across the area - a path which would have been quite obvious to detect if not for one very important feature: this next primal was an enormous snake, and his actively camouflaging scales blended into the bog with near-seamless effect.

Though the golem's sensors sometimes picked up faint visual inconsistencies as it explored, it mistakenly interpreted them as visual artifacts from viewing objects through rising vapors of the marsh, and tentatively correlated these visual artifacts with hypothetical refractive properties of the unknown brown fluid when in its gaseous state. The explanation was plausible - but in this case dead wrong.

By the time Unit D properly saw the primal serpent, the serpent had nearly caught the golem's head in his mouth. A split second reaction to feeling the air currents behind it disturbed by a sudden, enormous movement triggered Unit D into emergency high-speed mode, and it darted forward to the sound of the serpent's great-fanged jaws clapping fruitlessly together around the golem's previous position.

The serpent slid forward immediately in response, cutting a path through the trees and deep water. It was during this moment that the golem formally detected the primal and sized him up: more than ten times as long as Unit D was tall, yet at a height that came not quite up to Unit D's waist. The golem made no assumptions about the primal's smallish height meaning him to be less of a threat; Unit D's encyclopedic data on serpents declared them well-known for their adeptness at swallowing meals of great size.

His scales, in the places where his camouflage was disrupted enough to make their appearance plain, were very similar in color to the liquid in the swamp. The serpent's head was fat and stubby with a massive, puffy chin, alluding to the large venom glands inside. It had no hood, but it had a subtly double-ridged back that began behind the head and extended backward as far as Unit D could see. The tongue forked outward, its surface a brownish-black color and so massive that it almost seemed inappropriate for the mouth. The tongue flitted about, its nerves no doubt tasting the air in an attempt to identify the present intruder.

Unit D planted its feet and prepared to fight back against the fast-slithering serpentine monster, but its sensors hit a moment of confusion as the image of the serpent grew less and less distinct against the swampy background and eventually winked out of detection altogether.

Complicated triangulations based on motions of the water gave Unit D the correct idea that the serpent had actively camouflaged itself against the myriad browns and greens of the swampy setting, and then had pressed his body down into the water, which in this particular part of the mire came to Unit D's waist but not much above, even with the serpent submerging itself.

The golem remained on high alert and waited, letting its high-speed capabilities regenerate while waiting for the snake to show signs of a strike. A change in the flow of water off to Unit D's left warned it of the serpent's head moving into that area, but soon even this awareness got confused. The serpent glided through the water, moving smoothly past the golem before bending to start encircling it - in no way attempting to constrict, but to create a ring of tightly-woven currents that masked the true location of its head.

Unit D decided to take a third option. It reached a hand over the surface of the water to a nearby fallen-and-rotting tree, picked it up, and tossed its blackened wood into the water in a place where some part of the the serpent was likely to be.

The rotting wood did no damage whatsoever, but it did provoke a useful reaction: the serpent's head lunged up from the water and landed crossways over its own body as its fangs snapped at the useless bit of wood.

Unfortunately for Unit D, the rest of the serpent's body remained largely unseen, and even hypothetical calculations of its positioning could not rapidly enough account for its reflexive movements and other chaos. The golem needed to get this situation under control as soon as possible.

The golem ran through several ideas in a fraction of a second, and settled on one that appeared practical. Rather than attempting to do something risky and complex like tying the serpent in a knot to stop it from moving, Unit D did something much simpler: it punched the serpent in the face. It punched him with a wheeling, roundhouse swing from its left arm, accompanied by a forward stomp in the water. Then it punched him again, and again.

The blows forced the serpent's head backward from the impact, and prompted the creature to show its impressive set of fangs, the muscles of which flexed and emitted a brown liquid into the water that the golem quickly identified as consistent with the unidentified brown chemical found elsewhere. From this it easily surmised that the serpent must indeed have poisoned this swamp with its giant-sized supply of venom.

Curiously, although Unit D still hadn't detected a single living animal other than the primal, it did notice that most of the plants had apparently lived through the poisoning. Many trees survived quite well in this place. This was a helpful fact, for trees were weapons, and having seen that the attack on the creature's face went much like its first attacks against the horse had gone, Unit D now moved to collected a tree for weaponized use.

The snake snapped its jaws, and nearly caught the still-slow golem on the arm, but the golem got the limb away in time to reply with a heavy downward blow, stunning the creature's head momentarily and sending it into the water. With a brief reprieve thus obtained, Unit D took a few of its hunkering steps away and back out of the deepest parts of the water before reaching over and uprooting an old, oak-like tree as if it were a twig of candy-cane.

That done, the golem turned the tree at its attacker and jabbed with mechanically determined irregularity, prodding at its face with the tree's mud-encrusted roots and exciting the great snake to multiple new levels of agitation.

Then, to Unit D's chagrin, the primal began to blend himself into the surroundings again - and conducted more erratic movements.

Now recognizing the danger inherent in continuing to oppose the primal in this mirey environment, Unit D attempted to lead him onto drier land, but the serpent showed no intention of following.

Unit D paused for about three-quarters of a second, reconsidering its options.

One tactic that it had not tried yet would be to use its next burst of high-speed to destabilize its cores and then vent the heat and energy from the cores in an exhaust-liberating burst of force out of its own back, rather than just letting them ventilate normally. The downside was that doing this would only destabilize the cores further, despite the best intentions of the action to remove excess heat from the picture. Against most foes Unit D would not have considered something of this sort likely to help, but in this case...

The golem's mind reconsidered serpentine physiology. Modeling a scenario, it wondered what might happen if a heated blast could penetrate the serpent's genital slit and harm its reproductive system - which had clearly been a vulnerable spot for the stallion..

Yet, Unit D did not know where the genital slit precisely was on this wriggling, coiling creature, so for now it sought to gather information.

Unit D waited for the snake's next attack, edging its way closer to the water in a methodical series of steps. Soon the golem stood nearly on top of the nigh-undetectable snake - in fact the the golem drew so near that the expression "If it had been a snake, it would have bitten" would almost have applied.

Almost, except it was a snake, and it did bite. Unit D was ready, but not ready enough: the snake was learning from the golem's stereotyped movements and picked just the right moment to jam its duo of pearly fangs into the golem's left shoulder.

It could be called nothing short of a miracle that the circuitry for controlling the golem's left arm did not fail right then and there, but as luck would have it the blows mostly struck auxiliary areas useful in motions far more refined than punching. Unit D detected fine control of its fingers had decreased from the blow, but could still grip the tree well enough to retaliate, and it did so.

The golem's high-speed mode activated. Ramming the tree backward with the force of about a hundred battering rams all striking in unison, Unit D splintered the tree into pieces against the serpent's impervious hide, but dealt a firm enough blow to punt the creature's head backward and send its front parts flipping belly-up. It then ran hypotheticals as fast as it could, while processing visual data at accelerated speeds. Then, putting this information into action, the golem darted to a place on the snake's curled-up body that the genital vent seemed mathematically likely to be located.

Unit D held onto high-speed mode for as long as it realistically could, gripping the serpent's body with its left hand while running its right one (and some close-range visual sensors there attached) down the serpent's belly. A visual discrepancy alerted Unit D to the location of the vent, and it jabbed a hulking golem fist inside just as high speed wore off.

As expected, the serpent's genitals were hemipenes. Not as expected, they were many times larger than even the scale of the body would have led the golem's calculations to predict. Re-evaluating this information on the fly, the golem determined the ideal course of action to be gripping one hemipenis at a time and crushing that organ to the best of its ability. Unit D did this with mechanical ease, clamping its fist shut around what was (from the snake's perspective) the right hemipenis.

Despite being currently unexpanded and relatively flexible, the soft yet scaly flesh found the robot's crushing grasp impossible to endure. In an instant of firm-handed judgment the normally cool reptilian flesh heated up with pressure, and the tissues of its corpora began to crumple.

The giant serpent, who until this point had been trying to lash back up and bite the golem, now found his mouth bursting open in agony and his body pulling away from the golem's hand in reflexive shock. This sudden backward jerking of the snake's hind parts only made the golem's job on the first hemipenis easier, and thanks to their unintentionally combined efforts, physics did its work and tore off what was left of the severely crushed hemipenis, leaving the other in shock and developing a bizarre, rapidly everting erection.

The golem's hand slipped out of the slit on account of the serpent's backward yank, and the remaining hemipenis revealed itself immediately afterward, throbbing outward to an immense ten-meter length and a quarter that in girth. The golem tried to grab it, but found this impossible without high-speed motion, as the snake began whipping around the swamp in a frenzy, smashing its body against the golem's legs and doing everything in its power to buffet the robot around or otherwise disrupt its activities.

To the golem's further computational frustration, the snake's tail-tip and member soon became protectively entangled in the other far coils of the snake's body, which wrapped protectively around the erection and arranged the serpent's mass into something rather like a living ball-and-chain, with the head as the haft - except in this case the ball was a defensive measure far more-so than an offensive one. If anything, at least the serpent would be less mobile this way.

But, not content with defense alone, the serpent continued snapping furiously at the golem and pressing his way, forcing Unit D to begin walking backward through the mire while it waited out the cooldown. It stepped slowly and methodically, keeping up a steady guard: the primals could not be destroyed if it broke down under the weight of serpentine fangs, and the risk of getting caught and tripped in the rest of its writhing body, if it kept trying to fight aggressively here, was substantial.

With its caricatured god-face wearing exactly the same cryptic expression now as it always had, Unit D stepped diligently backward toward the mire's fringes, screening itself defensively with well-timed roundhouse punches that struck the serpent's teeth mid-bite and would have easily broken the fangs of any more vulnerable monster.

Yet even in his present end-tangled state the serpent was quickly overtaking the golem, and soon moved to encircle Unit D with his front half.

At that moment the high-speed unit came off cooldown, and the golem took swift action.

Unit D ran as fast as it possibly could, directly away from the serpent, and then vented a blast of core-heat in his direction. The stability of Unit D's cores dipped to almost-dangerous levels, but that did not matter: the blast served its purpose, acting as a signal flare to inform the irate serpent where his prey had gone. This time he drug his body angrily forward, his tongue flicking with furious regularity as he approached.

The golem stepped back into the ruins of the city whence it had come, and it waited. It lurked among the collapsed structures of the once-splendorous city of science. .

For about two minutes it continued to wait as the serpent's determined approach toward the city continued, with the beast refusing for the time being to reveal its damaged weak point any further. It lived willingly with the reductions to its agility that inevitably resulted from that decision.

Presently, the serpent's large head slithered its way into the city's ruined limits, and still Unit D silently waited.

Ambush tactics were not normally emphasized as part of the golem's protocol, but its battle against the serpent up to this point had been quite educational on the merits of such methods. With the serpent clearly enraged, Unit D postulated that reversing its own tactics against it in a different environment would have a high probability of enabling it to get at the remaining portion of the "vulnerable part."

Thus far, the plan seemed to be working: the serpent continued slithering further into the city, following mainly along the rubble of the roads, and now repeatedly tasted the air in an effort to pick up Unit D's scent. The serpent found this taste-testing difficult for two reasons: first, because the golem did not emit much odor in the first place, and second, because numerous similar smells permeated the ruins, including those lingering on some of the golem's recent tracks from its awakening earlier.

Though adept at combat in its swamp, the serpent found itself uneasy here, and its unease showed in the mix of anger and caution that riddled its movements - a slow slink around a ruin here, a fast dart down a straightaway there, always looking for the golem. Intermittently it would flail its balled-up rear like the very weapon it currently resembled, knocking aside hunks of rubble and turning weak building walls to dust.

The serpent could not have known that the golem had already rendezvoused with its own previous trail and then jumped up and over into the center of a donut-shaped pile of skyscraper rubble. Unlike an organic creature, Unit D did not need to breathe, and its heat venting ports were very quiet while not in motion, and it pointedly chose not to move at this time. Unable to be seen or heard by the snake, and only vaguely tasted, it seemed the golem had all the time in the world to listen and to wait for an opening..

Now growing more nervous than ever as it wound its way around Unit D's chosen donut of wreckage, the primal began shifting its camouflage to blend in better with the ruined cityscape, but the dark gray colors were difficult for it to match with precision in comparison to the dingy brown of its swampy home. Its efforts came close, but could not reach its usual level of perfection.

Likewise, the golem was at this very moment compiling visual memory-maps from its previous trek through the city and creating image-based sanity checks to prepare its visual processors for noticing the snake, working on the assumption that its camouflage probably still worked here. That this mental process basically amounted to a game of "Find the differences between these pictures" taken to a technological extreme did not bother the golem; it had plenty of processing power.

Then the opportunity the golem wanted came: The still-flailing, balled-up tail smashed through one of the walls of Unit D's hiding place, but the head of the serpent was still far up ahead, unable to notice the golem's presence.

Taking note of a massive fallen girder nearby, Unit D took one third of a second to run some calculations for use during high speed mode. That done, it set its cores to work.

The golem came charging out of the ruin with the girder in its right arm, holding its narrowest parts forward like a makeshift spear. Comparing the image it saw in front of it to data in memory, Unit D easily determined the location of the snake - then, using its more damage-limited left arm as a wedge, it forced the coils of the snake's tail apart enough to jam the girder inside. The girder slid through the serpent's protective coils like thread through a needle, and its tired metallic surface struck the remaining hemipenis hard.

The base of the erect organ erupted profusely with blood, the girder having left a deep gash that alarmed the great serpent and forced its eyes to go wide. The serpent instinctively lunged toward its own rear but got only a mouthful of the skyscraper rubble, which lay in his way due to the winding path he had taken.

With fast motion ending, Unit D rammed both its arms through the opening, taking hold of the girder and driving it down further into the serpent's cockflesh. Unit D sensed the flesh parting like meat under a knife and kept applying full pressure as the serpent's coils flailed in agony all around it. WIth painful slicing and breaking sounds, the flesh parted: skin, corpus, urethra, corpus, and skin again, until eventually the bulk of the member sliced off onto the ground, releasing its blood in a profuse spray before deflating into a worthless lump.

The serpent roared, and its body twitched erratically while Unit D struggled to keep its balance against the writhing of the monster's form. The golem gave the girder one more firm jab directly against the urethral remnants of the sliced-off base, stabbing and crushing what remained of the flesh and pressing the metal deep into the snake's body.

It only took a few more hissing, horrible moments after that before all of the snake's cells shut down in the same eerie unison as those of the stallion before it. The golem withdrew the girder - examined the body - took in chemical data. Unknowns - so many unknowns.

Diagnostic routines assessed the damage to self. Unit D remained the victor, but had lost some precision with its left arm and had suffered various dents to its armor. Nothing critcial - so far, so good.

Unit D filed the diagnostic data away and marched off, seeking its next foe with relentless obedience to its orders.

Story (C) 2013 dolphinsanity and was anonymously commissioned.