Vindictus (Korean: 마비노기 영웅전, Mabinogi Heroes) is a free-to-play hack and slash massive multiplayer online role-playing game created by devCAT, 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. Vindictus takes place in the same setting used in Mabinogi, but is placed chronologically several hundred years prior to the first game during a period of war and strife. Nexon America, Nexon's North American division, announced the new name on March 12, 2010 at the Game Developers' Conference in San Francisco
Basically, over in Korea, they have a new "XE" Edition server which you can go on if you want; it contains jumping, mid-air combos, new combos, shows damage numbers, combo counter, attacks take less Stamina, ect.
Basically, it's more arcade like, more traditional hack & slash. It is entirely optional to play the game on the XE servers, but it's quickly becoming the favorite mode in Korea.
Extreeem - cool
This looks nothing like Source any more. :O