Lineage2.com:
A Window to the Future

A dark temple in Rune Township holds a secret waiting for curious adventurers to discover. Priest Dominic of The Einhasad Temple will share with you the amazing truth of a people hidden away from the prying eyes of the other five races of Aden and Elmore. Speak to Priest Dominic in the temple to learn the truth - but be wary, as this priest harbors his own motives for sending you on this task.

Characters of any level can begin this one-time quest, so make haste to Rune Township!

Sounds like the quest to open up access to the new race!