Demon Hunter

Demon Hunters are dark, shadowy former warriors who are shunned by greater society. They made a pact, long ago, to fight against the forces of chaos using its own terrible powers against it. These mysterious warriors ritually blind themselves so that they develop 'spectral sight' that enables them to see demons and undead with greater clarity. They wield demonically charged warblades in battle and even call upon demonic energies to augment their formidable combat skills. Although they are counted as some of the mightiest warriors within the night elves' society, the demon hunters are always maligned and misunderstood for making their selfless pact with darkness.undefined Though many among the night elves and the Alliance fear the demon hunters and their pact with darkness, all know that demon hunters and their demonically-charged warblades have played an important part in combating what remains of the Burning Legion

For more information, look at the detailed article found here:

http://www.wowwiki.com/Demon_hunter