This section is intended to be an exact copy of what the survivor Helena Walker, the author of the dossiers, has written. There may be some discrepancies between this text and the in-game creature.
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Species
Desmodus Draculae
Time
Pleistocene
Diet
Sanguivore
Temperament
Aggressive
Wild
Even with all the other monstrosities around here, this fugitive from a Creature Double Feature deserves top billing. I mean, Dracula's right there in its species name! And Desmodus has a shriek that'll scare just about anything out of its way. It's also shrewd enough to limit itself to victims that it can carry off into the night.
Although I'm not superstitious enough to advise stocking up on garlic and stakes before you decide to track down Desmodus for yourself, I'd still advise you to hunt these horrors out in the light and away from their caves – they seem uniquely adept at flying and hiding in those dark, narrow spaces.
Domesticated
Taming one of these beasties lets you add its eerie abilities to your arsenal. Use their unsettling scream to scatter your enemies. Command Desmodus to snatch up small prey for you. Let its uncanny power to vanish into darkness become your personal stealth mode.
Desmodus has blood thinner in its saliva, which drains prey of more blood than this vampire could ever digest. If you can stomach the excess blood and drained meat your vampire pet leaves behind, you might be open-minded enough to appreciate another of its unholy gifts: a 'sanguine elixir' that helps enthrall the most stubborn beasts.
The Desmodus can commonly be seen latched to the ceiling in caves. They will detach and attack players if they get too close to them.
Appearance
A medium sized flying mammal with a nightmarish appearance similar to an overgrown Onyc. While it may look like an Onyc from far away they can be distinguished by many features like its fringed lips, blood red eyes, and large ears it is most easy to differentiate them when you see them hanging upside down which is a behavior not present in Onyc.
Color Scheme and Regions
This section displays the Desmodus's natural colors and regions. For demonstration, the regions below are colored red over an albino Desmodus. The colored squares shown underneath each region's description are the colors that the Desmodus will randomly spawn with to provide an overall range of its natural color scheme. Hover your cursor over a color to display its name and ID.
This information can be used to alter the Desmodus's regions by entering cheat SetTargetDinoColor <ColorRegion> <ColorID> in the cheat console. For instance, cheat SetTargetDinoColor 0 6 would color the Desmodus's "base" magenta.
After the gestation period the baby is born. Babies can be be fed with blood packs or raw meat, the latter will work better with Maewings due the blood packs cool-down, however it will feed 5 time less than it would on a common carnivore (so it will take 5 times more raw meat than blood packs in the same amount of time).
Type in values of a wild creature to see on which stats it's emphasized. Green values on a high-level creature are very good for breeding. If you have already tamed your creature you can try to recover the breeding stats with an external tool.[1]
Desmodus
The stat-calculator does not work in the mobile-view, see here for alternatives: Apps
Note that after the creature is tamed it gets bonuses on some stats depending on the taming effectiveness. This makes it hard to retrieve the levels on a tamed creature, so this tool is only for wild ones, but gives a first impression, how well the stats are distributed.
The Desmodus vanishes into thin air while ridden, preventing detection from all creatures (beside those that already have sensed it). Only available at night or while latching on a surface.
The Desmodus produces blood packs in its inventory when more than 50 damage is dealt. While wearing its saddle, it can produce Sanguine Elixir from 200 × Blood Pack.
Night Vision
Night vision can be toggled on and off via the circle menu. When the option is on, the rider of the Desmodus will be able to see at night, although with a heavy red tint. Unlike Night Vision Goggles, the screen does not brighten as light level gets higher.
Combat
This section describes how to fight against the Desmodus.
General
Strategy
Stay far away from Desmodus and used ranged, heavy damage weapons to take it out, because it heals when it attacks (not sure if this applies to wild ones)
Weaponry
A fabricated sniper rifle is an excellent choice, as is a longneck rifle. Both have the capability to kill Desmodus from at a range before it gets to you.
Dangers
Desmodus can pick players up and carry them off, much akin to a Blood stalker. The player has to attack the Desmodus, and the hits seem to have to hit Desmodus, otherwise it does not seem to work (not tested whether weapons release faster than fists). Desmodus has the ability to also pick creatures up. Desmodus also has the life drain ability, so it heals when it attacks a creature while collecting a small amount of blood packs.
Weakness
Taming
Desmodus can only be tamed non-violently rather than through the knockout methods. The creature only wants Blood Pack much like Bloodstalker. Due to the lengthy process of getting Blood Packs by default (Either by random Supply Crate or through Blood Extraction Syringe), it is advised to get any Desmodus possible before attempting to tame better levels of them due to the level not affecting the amount of Blood Pack harvested (1 Blood Pack/Hit per 50 damage dealt).
Allow it to grab you while carrying copious amount of Blood Pack. The item will be drained until it runs out, or its tamed.
By default, the taming efficiency starts lower than intended. Having it constantly grabbing and dropping a high health creature (i.e Moschops high in HP) that carries large amounts of Blood Pack will increase it.
Utility
Abilities
Every attack done by a tamed Desmodus results in the production of Blood Pack in its inventory, making the use of Blood Extraction Syringe redundant.
While wearing its saddle, with 200 Blood packs, it can produce Sanguine Elixir, a strange blood concoction that either gives 30% taming progress to a nearby unconscious and passive tame creature or a 30% imprinting to a baby not fully imprinted. (Both can only be done once). Therefore, Desmodus is an invaluable taming helper to anyone.
Holding left button blasts a scream, causing a loud screech to scare the enemies away. It also creates a form of echolocation pulse, highlighting nearby living individuals. Not only can it use echolocation to locate nearby enemies, but it can also inflict a 20% damage increase to any creature at night, including Brontos and Gigas.
Desmodus can grab smaller creatures with its legs using right button. While holding, you can activate its life steal ability via circle menu, which drains health from whatever its grabbed upon until it is drained of all health.
At night time, it also has other ability:
Desmodus can vanish into thin air while ridden, preventing detection from all but the most persistent creatures who have already sensed it.
It can use night vision in the form of a red hue.
Roles
"Mosquito"/Vampire Leech: As mentioned above, any attacks dealt by Desmodus will produce Blood Pack. With Preserving Salt in its inventory, it makes for a great blood harvester for certain things, like taming other Desmodus, or raising baby Desmodus or Bloodstalker. While nothing will boost Blood Pack produced, increasing Health will ensure survivability.
Echolocator Screeching Radar: Using "Screech" ability allows highlights of nearby living beings in front of where it screeched at, be it at land or at air. Increasing Stamina allows for more uses of it in between cooldowns.
Fly like a butterfly, sting like a bee... hang like a bat...?: While climbing onto a surface up or down, Desmodus can be commanded to go invisible so long as the stamina would allow (They do not retain invisibility while unmounted).
Fighting Specialist: The Desmodus is the most maneuverable of any flyer. It can move in all directions at the same speed while also diving straight down into a glide. This high maneuverability paired with a good bite range makes flying above any groud creature and attacking out of that creature's range or blind spot while not being hit yourself extremely easy. The Desmodus can easily kill the likes of Gigas by simply biting at its back and Wyverns by chasing them in their poor tuning circle. Other flyers can also do this but the Desmodus maneuverability makes using these strategies easy with minimal risk.
Cave Flyer: Caves do not permit mounted flyers inside by default. Desmodus is the only sole exception to this restriction.
Night-Time Egg-Thief: Desmodus' invisibility during the night allows players to fly up to eggs, even in caves, to check the levels without being noticed, and make a quick getaway after stealing the egg. Beware: Turning invisible after stealing an egg will not break aggro!
For information pertaining specifically to the real-world Desmodus, see the relevant Wikipedia article.
Desmodus won the Fjordur creature submission[2] vote organised by Wildcard in 2021[3], the original dossier was made in 2016 by Shadowenigma250x[4].
It bypasses the flyer restrictions in Fjordur's realms.
Desmodus can be ridden in caves even without turning on setting -ForceAllowCaveFlyers and with it's ability to hide itself and a rider it can be a great way to hunt for artifacts.
Yes
Region 0:
Region 1:
Region 2:
Region 3:
Region 4:
Region 5:
Onyc. While it may look like an Onyc from far away they can be distinguished by many features like its fringed lips, blood red eyes, and large ears it is most easy to differentiate them when you see them hanging upside down which is a behavior not present in Onyc.
Health
Stamina
Oxygen
Food
Weight
Melee Damage
Movement Speed
Torpidity
Cloning Chamber.
Desmodus
Element Shards
Blood Pack and 
Sanguine Elixir production
Night Vision Goggles, the screen does not brighten as light level gets higher.
Bloodstalker. Due to the lengthy process of getting Blood Packs by default (Either by random 
Supply Crate or through 
Blood Extraction Syringe), it is advised to get any Desmodus possible before attempting to tame better levels of them due to the level not affecting the amount of Blood Pack harvested (1 Blood Pack/Hit per 50 damage dealt).
Moschops high in HP) that carries large amounts of Blood Pack will increase it.
Preserving Salt in its inventory, it makes for a great blood harvester for certain things, like taming other Desmodus, or raising baby Desmodus or 
