Desmodus can be tamed with blood packs, it’s a passive tame, and you can give it smaller tames of yours to make its efficiency go higher for more levels.

The Desmodus can harvest spoiled meat in absurd amounts, the bigger the creature, the more spoiled meat you get, which is good for getting narcotics.

Desmodus can also harvest blood packs from creatures, without killing the creature. If you have 200 blood packs in the Desmoduses inventory, you can craft a sanguine elixir, which is good for taming, as it raises the taming bar by 30. It can also be used for imprinting + passive taming.

At night, you can use echolocation, which turns the Desmodus invisible, meaning you can easily steal Wyvern eggs, Drake eggs, etc.

The Desmodus also can fly in caves.

Easy way to tame them early game or as a first tame:

Spawn in the bottom left area and get situated (around level 20).

Few things are necessary:

1: Hide armour at least.

2: Bloas, Basic tools from wooden crates, ability to kill creatures when needed (mainly spiders and scorpions).

3: Locating the Emerald river. Wyvern-Trench esk rocks on the coast.

4: Enough blood packs. Repeatedly kill yourself by acquiring your own blood and respawn at sleeping bags or a bed.

Enter cave and do some simple mass murder. Head to the right on entrance as there’s less typical cave creature spawns and more desmodus. Using a spyglass you will have (crystal can be gathered at the emerald river), look for a relatively low level or something alone. Get nice and close and fire an arrow at it. It’ll be scary when it comes to you and you’re on the ground, but even if it doesn’t work, what’s there to lose. You’re only low level. When it picks you up, since it’s a low level, it’ll likely tame quite quickly. Whistle follow and quickly run away with your new pet bat or otherwise fend off the other bats. Or maybe tame them too.

Taming low levels is very easy to do, it’s a great way to get started on the map. It can’t do right much for now, no saddle. So it can protect you until you’re high enough level, look cool as hell, and be whistled to attack to get blood backs which allows you to make elixir. Easier taming. I believe it is craftable without the saddle, but don’t count on it. Enjoy your easy bat.

Theese things are busted, a good imprinted Desmy will drain stamina so slow you barely have to worry about it, natural nightvision, can fly in caves (and on aberration if you spawn one in ((fliers usually don't let you even hop on on AB), can turn invisible and latch to walls and ceilings you can use the echolocation to detect any enemies you can't see. They naturally regen health a little when attacking (you don't have to use the lifesteal just regular attacks regen health), they collect insane amounts of bloodpacks and from what I've observed as long as they have bloodpacks in their inventory they can consume them on a 30sec cooldown to heal 2000 health. They deal decent damage and are insanely maneuverable so they can take on absolutely any threat too. You can use weapons on the backs of them. They fly fast and can pick things up (from my observation their carry ability is in-between an argy and a griffin) also I can pick up a deinonychus WITH THE RIDER STILL ON IT with one (Saved my friend and his Deinon from lava once) and that's all the not that well documented stuff on this. This thing is insane.

They can be found In the cave near the emerald trench (the canyon with green colored crystals and hexagon rocks) follow the trench all the way up and there will be a cave with spiders centipede and onic (smaller non-rideable bats that can give you mega rabies so maybe bring cures) after you go In use a spyglass or if you have one a snow owl to look for them try to find a low level so it wont kill you and you don’t need as much blood then put the blood packs in your last inventory slot and get it to attack you and pick you up rinse and repeat until tamed then use that one to get blood and tame a higher level. Hope this was helpful thanks for reading ☺️

Baby bats will eat blood packs AND RAW meat and RAW prime meat like their parents, but raw meat will only restore 10 food for both babies and grown Desmodus and raw prime will restore 50 food for both. Neither will eat cooked meat or cooked prime meat. Blood packs restore 200 food for babies and adults.

So based off what we know Desmodus is a vampire bat, speculating that it will have an echolocation ability and be able to drink blood (somewhat like blood wyvern) it would be interesting to see if it could be used in some of the larger caves not necessarily as a flyer but as a climber along with possible attachment to enemies (like deinonychus), all just speculation, I hope people love it! :)