There is a Yautja clan called the Elite Clan which only the most experienced Predators can be part of. In order to be members of the clan, a Youngblood must gain the rank, one must be either an Honored Predator, an Elder, a Veteran, or be born into the clan.
Elite is one of several great ranks a Predator can receive.
In 2004, an elite predator (named wolf) arrived on earth responding to a distress signal transmitted by a crashed predator scout ship which was hijacked by a Predalien. Aboard the ship, many Facehugger containment cells were destroyed, allowing the creatures to escape and impregnate various hobos in the sewer. He took most of the equipment from the dead crew, and then set the ship to self- destruct. From there, he used a vile of unnamed blue liquid (which quickly dissolves body mass) to disintegrate the bodies of dead Facehuggers, and their hosts. After tracking the Predalien through the town of Gunnison Colorado he finally faced the creature, both wolf and the Predalien were mortally wounded in the battle, until they were both killed by an atomic bomb that was deployed by the U.S. military, in a successful attempt to eradicate the Xenomorph infestation.
Three Elites came to BG-386 (One of them is Dark) to investigate a distress call sent by several Youngblood Predators. One Elite is harvested by Six (although it is unknown if this Elite was apart of Dark's original landing party), and the other Elite who was part of his party was found by Dark dead amidst a large refinery on the planet. It's likely he was killed by the Warriors of the Matriarch before the Queen's own death at the hands of a human Colonial Marine known as "Rookie". Dark and Spartan are the only surviving Elites to return from BG-386 in the end.