Half-blood elf is the term used to describe the offspring of humans and blood elves. They do not yet exist. Since blood elves came into existence only a few years ago, they certainly have not had time to mingle with humans and produce adult offspring — without even factoring in blood elf prejudice. This does not mean that it cannot happen, however; it is possible it might happen 20 years in the future. The blood elven half is more dominate and they have the blood elven racial traits.
Like their blood elven parents, half-blood elves are addicted to the use of arcane magic. A half-blood elf must spend one hour each morning in meditation, resisting the distractions of their addiction, or have problems with spellcasting or spell defense for that day. Half-blood elves slake their thirst through the absorption of fel energies. If the blood elf partakes of demon's blood, the magic addiction abates for a number of days. Half-blood elves reek of fel power, offending the spiritual senses of night elves and tauren.