Invent new monsters and/or revamp preexisting ones

Or, they come over an enemy colony/homeworld, and fire their own spores down at the planet, subsuming them through bioweapons of their own devising, ensnaring them under their own control, and breaking down the captured cities and populations as fodder and fertile soil for a Thorian to rise out and subjugate/ensnare the world.

A fun thought of such rapidly evolving and centralized organisms is that they have the same issue of every VonNewnan swarm.

Deviation! With enough separation and time such organisms will evolve into different species that might then go and compete or even hunt those that differ enough from them. Even without much genetic drift, a being that can become a planetary organism might have a big ego/soliphistic/paranoid enough to not want peers in its sphere of influence.

The link to fanfiction mentions galactic range ftl control of thralls so that might even allow for a single-mind-Kardashev-3 civilization. Heck if I were one I would transplant myself to a megastructure like a Dyson sphere and never reproduce.
 
Vanta Moth, bleeding shadow (Scoliodori Erebae)

Unique member of the order lepidoptera they are large manta-shaped, nocturnal, predatory moths with a wingspan ranging between 18 and 25cm. The most salient features of Scoliodory Erebae are its peculiar dark and sound damping coating and it's diverse diet.

Scoliodori Erebae is covered in fine coating of specialized scales and nano setae arranged vertically in a way that create a hemispherical reflectance of 1.2% and significantly reduce flight sound. These traits support its predatory/parasitic lifestyle.

Scoliodori Erebae feeds on insect hemolymph and blood of small mammals it hunts and drains with its proboscis. They are also opportunistic parasites on dying and injured bigger mammals.

Rarely and triggered by unknown factors Scoliodori Erebae can engage in swarming behavior resulting in what are colloquially known as "Devouring Nights" where incredibly large swarms of moths blot out all light and engage larger prey in an uncharacteristic feeding frenzy. The forced evacuation and regurgitation of this continous intake results in the characteristic "blood drizzle" that covers surfaces following a devouring night.

I like this. Moths that evolved into vampire bat analogues, including the social roosting behavior.

The devouring night sounds like it could be caused by a disease that messes with their digestive systems and easily spreads throughout the roost. The end result being hundreds of thousands of the moths all starving at the same time.
 
The devouring night sounds like it could be caused by a disease that messes with their digestive systems and easily spreads throughout the roost. The end result being hundreds of thousands of the moths all starving at the same time.
ohh that is a awesome idea!

the core concept was "what if locusts ate blood instead of plants" but the idea that the creature itself is suffering as much as its victims when it swarms is so much more awful its great.
 
ohh that is a awesome idea!

the core concept was "what if locusts ate blood instead of plants" but the idea that the creature itself is suffering as much as its victims when it swarms is so much more awful its great.

Well, I was actually inspired by three different things.

1. While the evolutionary benefit of locust swarming behavior is unknown, it's known to be triggered by locust overpopulation. So, the idea that the swarming bugs aren't having a good time to begin with is already in there.

2. You described them regurgitating blood all over the place. In general, haemivorous insects only do that when they're having digestive illnesses.

3. Connected to the previous; most insectborne diseases have to make the insect sick as well in order to spread. For instance, malaria actually triggers vomiting in the mosquito while it feeds.

Putting all this together, it sounds to me like the moths picked up a disease that's adapted to a different insect species, and it's causing much more severe and destructive (for both itself and the hosts) symptoms in the moths.
 
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I've got my idea when was thinking about possible fictional materials. So maybe I should write here while inspiration with me.

Eldritch Invader - it's a weird species of different shapes and sizes. However, their theme is 'armored millipedes with wood-like materials composition'. These are creatures that have evolved to counter sentient and sapient species. Their bodies are full of cognitohazardous and memetic threats that stand up well against many advanced beings. Their carapace cannot be looked at safely, the noises they make cannot be heard without side-effects, the study of their insides slowly drives the sentients insane and destroys measuring instruments, their breath contains a viral agent that settles in the form of patterns and makes one forget existence of these things, do not pay attention to creatures and seeing them something normal, background. Invaders are adapted to withstand the four main groups of threats that can be expected from developed creatures:​
  1. Ability to long-term and short-term planning.​
  2. Ability to study problems and create specific tools to solve them.​
  3. Ability to act in a coordinated, collaborative manner, to use social constructions.​
  4. Ability to observe, collect, store and process complex information.​
These creatures travel between dimensions in search of prey. They don't have our usual sense organs. They don't hear, they don't see, they don't feel smell... But they have a highly developed sense of touch, a kinesthetic sense and some unique sensations. They are able to sense quantum-level gravitational phenomena, allowing them to sense the mass of objects, the direction of gravity, momentum, inertia and even shape of surroundings. Second, they have a temporal sense. It allows them to feel cause and effect, in fact, to see the past and future of a certain volume around. Not too far, but accurately. This is not sight or hearing, these are packets of information in the form of logical chains, like an incredibly detailed textual description and intuition. They need such sense organs mainly in order not to suffer from the infohazards of their own bodies.

They come into the world and adapt to its conditions. Then they begin to multiply: by division, budding or laying eggs. In the process, suitable units are created to work in a particular world. They are always hiding, trying not to let the locals know about themselves and study themselves. Their bodies store a huge database, with a great number of complex algorithms that allow them to act unconsciously in many situations. Their emotions are alien to us, their actions are incredibly complex and rational, but they themselves do not carry a drop of reason. It's more of a gray goo that can recycle civilizations into copies of itself.

In theory, they can eat almost anything, turning it into their own crude version of the сomputronium that makes up their bodies. Some materials take more time and resources, some need to be adapted, but it's still effective. And if it doesn't work out, then they can eat a local representative of intelligent life or get data by observation and precognition. They leave nothing behind. Anything that can be recycled into copies of themselves will be recycled and assembled into a huge hive, which sole purpose is to cover their tracks and send a new generation of Eldritch Invaders to other dimensions. The places they have visited are devastated, containing little or no traces, or filled with traps aimed at preventing cognition, if properly covering their tracks fails for some reason.​

 
Warwere: While they are believed to be the result of an attempt to enhance and militarize lycanthropy, Warweres do not appear to have ever been used as battle by their unknown creators. Most likely because the creators in question were eaten at some point.

Rather than being a merger between human and a conventional animal, Warweres are a blend between a human and an artificial creation dubbed a "War Beast", much more formidable than a natural animal. As well, a partially successful attempt was apparently made to keep beast and human separate with the human mind in ascendance, with some odd results. The result is a creature with some obvious commonalities with conventional lycanthropes, but also some notable differences. There are also two varieties; the deliberately made "Greater Warwere", and the "Lesser Warwere" created by accidental infection.

A Warwere has either three or two forms, depending on if they are of the Greater or Lesser type. Human form is what it sounds like; an apparently human form, although physically enhanced in every way. Humanform Warweres are prone to aggression and violence, but basically rational and capable of self control. They are also nearly insensitive to pain and capable of rapid complete healing, so among themselves at least their tendencies to violence are more an annoyance than anything.

Their second form shared by both Lesser and Greater Warweres is the Warbeast form, their "animal" component. The Warbeast shape is four-legged, with a body resembling a scaled cat and a head shaped like a cat-eyed wolf. They have a mane, back-crest and tail tufts that resemble fur from a distance, but up close can be identified as flexible spines (which are venomous, as it happens), with the rest of their body armored in scales. Tougher, faster and stronger than their human forms and equipped with claws & fangs that can rend both metal and stone, this shape a formidable combatant. Unfortunately, Warweres in Warbeast form are at best barely rational near-berserkers, and can easily lose control of themselves entirely. Worse, Warweres during the full Moon involuntarily take on their Warbeast form, and entirely lose their reason becoming pure killing machines. And since unlike normal lycanthropes they can tear through metal and stone, most methods of restraining them are futile; lock them in a basement vault during the full Moon, and they will tear their way out eventually.

The third form, the "Trueform" is available only to the Greater Warweres is their oddest, and apparently the result of the attempt by their creators to keep person and beast separate. The Trueform is a bipedal merger of human and Warbeast, but rather than a blend of forms it is more a combination. A Trueform has eight limbs and a tail, with two legs and six arms; the upper two pair of arms humanlike if clawed, with the lowest pair much larger and heavily built with longer claws. While usually bipedal the lowest set of arms are long enough that they often "knuckle walk" on three or four limbs much like an ape when in a hurry. Their heads have similar duplication with two concentric sets of teeth, four mobile pointed ears, and four eyes; an inner humanlike set and an outer set of catlike Warbeast eyes. Notably, each pair of eyes tends to look at different things, and expresses different emotions; the human eyes appear calm, the Warbeast eyes enraged.

Trueform behavior is likewise oddly split; their body language and tone of voice is bestial and angry, while their words are calm and rational. Mentally they are much the same; in Trueform both their animalistic Warbeast mind and human mind are active at once but separate, with the human mind dominant over and directing the Warbeast one. Their human personality is actually calmer and more rational than when they are in human form, almost detached in fact. This does have the somewhat ironic effect that their most formidable and scary-looking form is also the form they prefer for intellectual tasks and reasoned discussions.

Warweres are immune to ageing and disease, and very hard - but not impossible - to kill. Silver plated weapons do more harm to them and the wounds heal slower, but are not nearly as effective against them as against conventional lycanthropes; one of their improvements.

Warweres can't breed naturally as the change of forms destroys any pregnancy. They are however infectious, any human wounded by one has a chance of contracting the condition and if untreated will either die or become a Lesser Warwere. Warweres can also deliberately transform someone, in a ritual involving certain magics and crucially the direct transfer of blood to the subject. The result of such a ritual if successful (if unsuccessful, it's fatal, although it's less risky than the Lesser transformation) is a Greater Warwere; unfortunately, this ritual doesn't work on the Lesser Warweres, leaving them stuck as they are.

Due to how difficult it is to contain them during their full Moon rages, Warweres are typically found either far away from other people, or right in the middle of advanced regions that actually have the wherewithal to contain them when necessary and not much in between. There are entire islands known to be populated solely by Warweres, for example. Warweres that find themselves among humans without the ability to contain them tend to be either driven out or be killed, given how much damage they inevitably cause.
 
They have a mane, back-crest and tail tufts that resemble fur from a distance, but up close can be identified as flexible spines (which are venomous, as it happens), with the rest of their body armored in scales.
So can they sling their tail spines like IRL manticores, or was that capacity missed by the developers?
A Trueform has eight limbs and a tail, with two legs and six arms; the upper two pair of arms humanlike if clawed, with the lowest pair much larger and heavily built with longer claws.
Unusual to have the longest limbs not at the corners. Sounds like they aren't optimized for throwing, though maybe bows make up for it.
Warweres can't breed naturally as the change of forms destroys any pregnancy.
Unless they're willing and able to spend months as a ragebeast, presumably? Also, could they cross with more conventional lycanthropes?
 
Pseudo Coconut

A type of crustacean-like creatures that is able to curl up into a shape indistinguishable from a coconut. They love to lie on the sand in the sun and eat a variety of plant foods at night. For reproduction, these creatures find a suitable coconut tree with immature fruits, into which a complex biological cocktail is injected through a special temporary tail sting. Usually one crab is able to infect two to three coconut before they run out of material or the temporary sting breaks. This is a very exhausting period of their life, during which some individuals may die. An infected coconut at first glance develops like a normal tree fruit. However, in reality, it gradually turns into a pseudo coconut, receiving food from the tree 'parent'. These creatures have a strong shell and have a weak ability to photosynthesize, their meat is sweetish and closer in nutritional value to plant foods like beans.​
 
Dragons

Dragons are slightly reptilians giant creatures which live in more than three dimensions. Always only part of the dragon's body is visible - that's why each dragon is described differently, but always grotesquely. Basilisks and hydras (and many other monsters) are just dragons. "Dragon fear" or "basilisk deadly sight" are just results of human senses observing something that mind can't comprehend and going crazy. Stories about hydras where "two heads regenerating in place of one" are based on the fact that in each moment another number of heads/tentacles/other appendages of dragon can be visible. Dragonslaying heroes are people with mutation, which gives them immunity to "senses overload" during meeting with hyperdimensional beings.
 
Sometimes I'm thinking about how horribly dangerous it would be to live in the world filled with things from all these SV 'let's invent something' threads. :drevil:
 
What I don't get is, how come these guys didn't evolutionary outcompete baseline humanity? Our winning adaptations are collaboration and tool use. They can also do those, but more effectively, and they have no reason to empathize with non-seerlings and 'know' the continued existence of non-seerlings poses a potential threat to future kin, insofar as they use resources which might've been used by seerlings instead. So why didn't they drive all other hominid species extinct with massively superior technology (agriculture and the population numbers it could sustain vs hunter-gathering ought to be enough) right from the start?

I mean, maybe they know something we don't and have spent their entire existence as a species building tools to make the tools to make the infrastructure for a migrant fleet and running away or something, but as is, they seem like they'd easily beat us at everything.
 
What I don't get is, how come these guys didn't evolutionary outcompete baseline humanity?
Who knows? That's a central issue in dealing with them, so much of what they do makes no sense to anyone but themselves until long after the fact, if ever. Arguably they have already "outcompeted baseline humanity", given their ability to manipulate humans and human society like everything else. Humans are, ultimately, going to be acting in the interests of the Seerlings whether they realize it or not.
 
What I don't get is, how come these guys didn't evolutionary outcompete baseline humanity? Our winning adaptations are collaboration and tool use. They can also do those, but more effectively, and they have no reason to empathize with non-seerlings and 'know' the continued existence of non-seerlings poses a potential threat to future kin, insofar as they use resources which might've been used by seerlings instead. So why didn't they drive all other hominid species extinct with massively superior technology (agriculture and the population numbers it could sustain vs hunter-gathering ought to be enough) right from the start?

I mean, maybe they know something we don't and have spent their entire existence as a species building tools to make the tools to make the infrastructure for a migrant fleet and running away or something, but as is, they seem like they'd easily beat us at everything.
Maybe they have very poor endurance? Really, a lot of these 'humans but better' monsters should come without much worse endurance just from the extra energy requirements of the 'but better' part. Humanity's ability to sweat and run all day is a very scary superpower that a lot of more ambush or magic focused species really shouldn't have.
 
I may be misremembering pertinent details, but...

Maybe their tendency to optimize for long-term goals they actually like results in them being individually longer-lived but slower-breeding, and relatively conflict-averse? Maybe they're not actually as good at direct confrontations? Is their precognition as reliable and good under all conditions, so that they can pull Jedi-tier shit in combat, or does the complexity of the contingencies of having someone right up in your face reacting to everything you do start to make it more difficult for them to foresee outcomes?

Because these things would probably instinctively avoid fucking around and finding out in conditions where their prescience seems unreliable for the same reasons most animals without excellent night-vision avoid fucking around and finding out in the dark.
 
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The bits of an organic computer that isn't quite dead, forever haunting ancient ruins and cannibalising each other to last a few more years, until the entire place is eaten inside out like bleached bone. Their ultimate goal is to reestablish their 'hardware'- and to that end, unlucky animals or even people who they catch unawares suffer the horrific death of worm like tendrils swarming through their orifices to eat them inside out and multiply like an enormously scaled up virus. Without treatment, the worms inside them core them out until nothing is left but a wriggling meat puppet, uselessly attempting to enact long forgotten bits of code as all extraneous details rot away.

Worse, however, is that no matter how much biomass they acquire and nervous systems they hijack, they've lost too much of themselves to successfully perform even if their surroundings were in good shape. Upon inevitably realising this, they will endlessly and uselessly look for more bodies to fix this.

If you see what seems like a boneless tube of human skin and scraped-off details rolling towards you out of the dark in an alien ruin, try to stay out of reach.
 
Hmm, found one interesting concept for species. I think, it's interesting, but not sure if it's fitting for theme of this thread.


 
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So if these adaptive halfings hung out around giants, they'd grow enough to be medium sized akin to Orcs, Elves, and Humans?
I have no idea, really. But I guess it should work like that. It would look interesting.
 
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(agriculture and the population numbers it could sustain vs hunter-gathering ought to be enough)
I don't know a huge amount about this, but forest gardening (the sort of thing the native Americans did to large portions of America) is probably quite a bit more efficient in terms of land use. To creatures with long-term precognition, it definitely seems more on-theme.
 
Not sure if this has been done before but...

Invisible Vampires

One of the common issues with invisibility is that the user would effectively be rendered blind due to light not being able to interact with their eye. But, if the invisibility spell words by keeping light from interacting with the user, there's one type of monster that could get some real use from that. Vampires.

If vampires are injured by sunlight and invisibility blocks light, then a vampire could use it to bypass one of their main weaknesses. If it's bright outside and they need to move, they just turn invisible and saunter through broud daylight uninjured. As for the whole "being blind" thing? Echolocation. An invisible vampire using echolocation to navigate while moving unimpeded through broad daylight could be pretty damn spooky, especially if they can still attack or interact with their environment without breaking their invisibility.

And finally, one other thought: What if it's the sort of invisibility that can let people see you in mirrors? Imagine if normal vampires are visible but can't be seen in mirrors while invisible vampires only appear in mirrors.

So long as their invisibility does it's job of blocking sunlight, a little thing being seen in mirrors might be a minor inconvenience (especially if it results in people checking mirrors for vampires instead of trying to detect the invisible hunter right next to them).

So yeah, vampires that can essentially negate one of their biggest weaknesses by seemingly "trading places" with their own reflection. Normal vampires are invisible in mirrors while invisible vampires can only be seen in mirrors.
 
Basically SV, what are your ideas for either original monsters or various monsters from existing mythology/fiction that are actually interesting/aren't overused?

The fae. Historically, and in folklore, they are absolutely terrifying. While they tend to be watered down into almost tinkerbell-esque creatures in most modern depictions, I would love to read a monster story where the protagonist goes against the fae in some way. A lot of them are also scary as hell, so you have ample opportunity to mess around with designs while still staying true to the folklore.
 
The fae. Historically, and in folklore, they are absolutely terrifying. While they tend to be watered down into almost tinkerbell-esque creatures in most modern depictions, I would love to read a monster story where the protagonist goes against the fae in some way. A lot of them are also scary as hell, so you have ample opportunity to mess around with designs while still staying true to the folklore.
Dude, the difference between the original-lore Fae and Lovecraft's Great Old Ones is that the Fae are older stories.
 
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