Howdy, this is not advertisement im just helping my fellow gamers out.
If your interested in a free tera online beta key go to this site
http://www.gamersbook.com/scene/beta/tera-500/
Create account for their site, slap the get key button and you will have it emailed to you.
For the skeptical
Ofcourse go to Official site to enter code and download Client once done, You're welcome!