The next TERA update, Hero’s Oath, will be heading out the gate to PC players on June 7th. It includes a brand new dungeon called Antaroth’s Abyss for level 65 characters and features some awesome rewards. In addition, Hero’s Oath will include dungeon leaderboards, the Heroic Oath gear set and a new mask.
Source: N4G PC Hero's Oath Coming to PC Players on June 7th