The Survivors of Lemuria
Both orcs and elves can interbreed with humans, and it has long been documented that, despite their dislike for one another, there is a relationship between elves and orcs.
Sometimes that relationship is parental.
The Elf-Orc is a rare creature with one elvish parent and one orcish parent. They have a distinct predisposition toward evil. They are capable of becoming fighters, clerics, wizards, thieves, or assassins, plus any combination thereof, assuming they are able to meet the attribute requirements.
Elf-Orcs gain one point of CON and one point of DEX, in exchange for losing one point of CHA, one of WIS, and one of INT. Elf-orcs have 90’ infravision, and the elven ability to detect secret doors.