Vindictus is a "hack and slash" MMORPG created by devCAT it is using the Valve Source Engine, and an internal studio of Korean free-to-play game publisher Nexon. Vindictus is a prequel to the popular MMORPG Mabinogi and is known as Mabinogi Heroes outside of North America and Europe. It is currently only avaible for NA.
Lost Artifact Update trailer
Heavy gameplay :) :