Updated Tue, May 14, 2013 by Martuk
Are you raid ready? TERA’s latest update is. The latest addition of new content for TERA adds the new Kelsaik’s raid with a 10 & 20-person version, both with their own achievements. Along with the raid, the update also adds solo- or duo queue options for Champions’ Skyring, removes the prologue tutorial, squashes several bugs, and more.
The update isn't huge but it does contain several bug fixes and some other adjustments to features as well. Check out the patch notes for the full list.
Source: TERA Patch Notes