Aspect Warrior
The majority of an Eldar Army is composed of Guardians. These are not professional full time soldiers, but rather just civilian militia.
The Elfdar do, however, have specialized warriors known as Aspect Warriors
Their focus themselves to honing martial abilities by following the way of the warrior which, due to Eldar anal-rententiveness, can lead them to become utterly obsessed with their job and incapable of doing anything else. All Aspect Warriors fight according to one of the aspects of Kaela Mensha Khaine.
Aspect Warrior Types
Dire Avengers
Basically upgraded Guardians. The original founder of their temple was Asurmen, the first Phoenix Lord. They are good all-round troops, with the ability for their Exarch to be upgraded with a power weapon or Diresword, or some sort of miniature void-shield. They are given Avenger Shuriken Catapults and Aspect Armour, which gives them a decent save in comparison to other Eldar, and an increase on the range of their Shuriken catapults.
They represent Khaine in his aspect as a "noble warrior",
Striking Scorpions
Eldar answer to Khorne Berzerkers and Ork Boyz. Their founder was Arhra, but he was corrupted and Karandras took his place. Sneaky dudes with chainswords, shuriken pistols and some sort of energy emitter on their mouths. The Exarch can take another chainsword for +1 strength or a powerfisty Scorpion's Claw.
Howling Banshees
Jain Zar decided to take power weapons and boomerangs and form this aspect. Fleet, high I and power weapons mean that if you get lucky on To hit and To wound, your opponent will cry.
Fire Dragons
If they get within 12 inches of anything AV14 and below, it's going to blow up within the turn. They have meltas and meltabombs but oddly, the Exarch can take a big flamer instead of his big melta. Fuegan is the bestest tank destroyer out there. No question. He's also a beatstick in CC, carrying a burning axe that lets him fight like a monstrous creature.
Dark Reapers
Something like a hybrid of a Dire Avenger and Fire Dragon. Use them to kill MEQs and AV10-all around vehicles. The Exarch can take a big missile launcher normally only seen on support platforms or Wraithlords. Phoenix Lord Maugan Ra founded this aspect.
Shining Spears
If you love jetbikes, sign up now. They represent the spear of Khaine, striking at ridiculous speeds and withdrawing. Nobody knows their Phoenix Lord.