Go to http://gw.gamewikis.org/wiki/Main_Page
And put it in the 'Search' box.
Do this in future as well, quick, effective way to find ANYTHING to do with GW.
To answer your question about an elite skill...
Quote:
An elite skill is a special type of skill that is generally more powerful than normal skills. Elite skills can be identified by a golden border surrounding their icon. Elite skills cannot be purchased from skill trainers like normal skills can. Instead, Elite Skills are "captured" from a paticular boss, via a Signet of Capture. Elite skills are not available at all until the Crystal Desert in Prophecies, Kaineng City in Factions, or Kourna in Nightfall. A character may only place one elite skill in his skill bar at a time; putting a second one will cause the first to be automatically removed.
Taken from the wiki
