Many people aren't saying it here but the seemingly best spot to find desmodus are in caves, like the jade cave at 65 lat - 40 long or on the bottom left island in the first large divet of land on the map if you follow the coastline east, you'll see the green crystal nodes and the Greenland style plates of rock near the snow biome. Happy rabbies time
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.
If you are entering a cave you know has these keep blood packs in you hotbar, they will take those instead of dealing damage to you. Plus you might accidentally tame it and have something to help distract the other desmodus
These tames are insane at killing alphas I have a 170 was a level 80 wild tame and I have killed over 20 alphas in two days that includes level 90 alphas Rex’s they are also use blood packs to instant heal once they reach a low enough health percent
When encountering you will want to stay a ways back. It will probably have a far agrro area so you will need to stay back and shoot it. It will likely be with onycs to so you will have blood loss and tons of angry bats. It will reside in caves and will be like a vampire bat so watch out. It will stay away from but it may be stronger than the onyc so it leads me to believe it may fight titanaboa cause it is the apex predator of onyc so the desmodus will fight it cause the titanaboa thinks desmodus is onycs. There