Wood Elf blood is a rare ingredient in Skyrim, and it can be used in various alchemy recipes. To obtain Wood Elf blood, you'll need to either loot it from Wood Elf corpses or kill Wood Elves and use the Blood Extraction perk to extract their blood. If you want to kill Wood Elves for their blood, you should know that they are the most dangerous of the playable races, with an impressive amount of stamina and a unique ability that allows them to heal rapidly from any wounds inflicted.