This item can be purchased from Merchants:
Because of their extreme power and high worth, these objects are currently found only on the dragons in each realm's mainland. On their death, Golestandt, Gjalpinulva, and Cuuldurach will now drop fifty Luminescent Stones. Half of these will be Full Career Skill respec stones, half Realm Skill respec stones. These stones can be traded or sold to other players as any other object in the game.
Luminescent stones can then be taken to special new type of NPC and turned in to receive the associated Career or Realm respec.
Please note that after performing a respec, all choices made are your responsibility. Here are the respec NPCs, the objects they will take, and their respec abilities.
Can be purchased from Trishy (Alb), Brohd (Mid), or Elenora (Hib) for 25 Dragon Scale.
Per patch 1.109c (09/20/11):
The following Respec Stones have been changed to allow them to be /useable instead of having to turn them into the appropriate NPC:
Full Skill Respec Stones:
Luminescent Exerpise Stone
Incandescent Exerpise Stone
Luminescent Iterare Stone
Single Skill Respec Stones:
Luminescent Ceriac Stone
Realm Respec Stones:
Luminescent Exeregum Stone
Luminescent Abrogo Stone
Luminescent Induco Stone
All respec stones must be unstacked to be /used.
Full Skill and Realm Respec Stones may only be /used if a character does not have any full skill or realm respecs available. Single Skill Respec Stones may be /used if a character has zero or one single skill respec available. Type "/respec" in-game to see the available respecs for a given character.
Characters must still visit their trainer in order to perform a /respec."