This video shows you where to find 4 of the 5 bloodlines to harvest at 1 location. Much more efficient way than the other videos out there. You can find a dark elf at many bandit camps in order to harvest dark elf blood.
Here are the time stamps when I'm collecting blood samples for this quest.
4:22 - Wood elf blood
5:53 - Orc blood
6:21 - Falmer blood
7:01 - High Elf blood
You can usually find a Dark Elf at any bandit camp or you can simply go to Solstheim. Solstheim is home to the dark elves. Hope this helps! Thanks for watching!
![](https://i.ytimg.com/vi/BAofv0ZT5rA/mqdefault.jpg)