Ichor was the "blood of the Gods" of Greek mythology. When consumed by humans, it acted almost like a drug, inducing a "high". It could be passed down to part-human bloodlines descended from gods, who could be made immortal like their ancestors if they consumed ambrosia, whereas ambrosia was toxic to ordinary humans.
In 2021, an immortal who returned to the mortal plane with the help of a ghost, and allowed a group of sanguinarians to drink some of his "blood" so that he could in turn harvest their life force to strengthen the ghost, used the name of Ichor for himself. (HOMEVID: Ichor [+]Loading...["Ichor (home video)"])
The blood of a Homeworlder was described in one source as "Homeworlder ichor". (PROSE: A Farewell to Arms [+]Loading...["A Farewell to Arms (short story)"])