NHN Corporation has just noted that "after a period of intense development," the team has met several key milestones and they plan to test them all out during the October 23rd Closed Beta weekend. One of the most significant changes to the game is a rehaul of the player killing PvP system, where low level players were constantly being preyed on by the more experienced users. Heejin Jeong, Senior Overseas Sales Manager at NHN notes that they "want everyone to be able to enjoy Karos Online from the beginning, so the game has been changed to restrict player-killing to characters of level ten and above. We believe this will ease many of the issues for new players while still retaining the competitive spirit of Karos Online."

This new closed beta weekend will see players able to progress to level 35 and given the opportunity to explore the new region of Peltrok. The Karos Online team has also introduced a new class, the Mystic, who joins the previously announced classes of Blader, Rogue and Bowmistress. The Mystic is a member of the graceful, half-elemental Seroine race, and a powerful class of female warrior. In battle, she can use nature magic to blast at her foes, or she can turn it upon her allies and help keep them alive. Like all classes in Karos Online, the Mystic can specialize twice during her growth, and at level 15, she can become either a battle-focused Mage, or a Cleric who provides allies with a variety of vital buffs and healing.