Half-Elves are born to Elven and Human parents. Because of the differing ideologies of the two, Half-Elves are often ostracized. Cilion Elves view Half-Elves with a sort of pity, because they know that the child will never grow as old as the Elves will. Tyrian Humans often view the Half-Elves with wonder, and seek to learn as much about them as they can. Because of this, Half-Elves take easily to adventuring.
Same as PHB