Go to halted steam mine or whatever its called d, just north of whiterun.. the one with alot of iron ore.. there's usually a wood elf, orc and on this playtheough a dark elf as well for bandits.. when u go through the mine to the back exit, there's a dead high elf. Then a three minute walk east to shimmerist cave for falmer. Pinewood home or whatever its called (sorry, not at my xbox to check) sometimes also has all elves except falmer as well. The wiki has info if u search the quest.. uesp.net probably also has tips.
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darkhouse999 posted... Also the ruins that you need to use to get to Blackreach the first time has almost all the blood samples you need.
Has everything except an orc, it's where I got four out of five samples. Was pretty easy too, since you're there soon before you need the blood. The enemies shouldn't have respawned if you head right back there to collect blood samples.
I think alot of people overlook where to look for a high elf. In the last area of the Alftand Animulculory just before you go into the Cathedral, there is a high elf corpse named Valie laid down. Do not loot it until you get the Harvesting Blood quest and then come back to harvest Valie's blood. For the other blood types, just go to Liar's Retreat. If it's too hard to take on all the falmers, lower the difficulty and stay near the front door. Just kill one falmer at a time and go out the door. Then come back. Rinse, repeat.
Alftand has every single sample of elf blood you need except for Dark Elf one, but there are several corpses of DE laying around, one is the the alchemist pond by falkreath's windmill, another is in a cave outside the Thalmor embassy.
It took hundreds to kill me, but I killed lives by the thousands - Luca Blight