Best action-RPG out there, but it gets get boring after a few weeks.
Other unique gameplay mode is Master, its basicly kill the leader, but this time the person with the highest score gets some boosts so he'll be harder to kill.
The classes are unique and what you could expect from them, Warrior is a strong fast warrior, Blacksmith is a huge, broad warrior carrying a hammer, doing alot of damage, Archers have good range attacks, somewhat medium close combat, and mages have extremely powerful range weapons and weak close combat, and Ninja's are just extremely quick but lacks in damage.
Classes have control over various moves they can perform, its just simple combination like Jump + Left mouse click performs an air attack, there are more powerful attacks, but they take about two seconds to perform, its a game based on skill and how good you handle each class.
The game lets you start an tutorial for each class, you'll learn how to do certain range and close combat attacks, it also pits you up with some spiders to kill to proceed in the online world of Rakion.
Theres a summon addition, you can purchase summons (ranging from small spiders, to massive dragons in later levels) and put them up at you're side, their a nice addition but don't play a big role in the game.
The chaos mode tho, is fun, if a player gets 6 killers, they'll be able to transform into huge, overpowered creatures, that can kill players within seconds, each class gets its own unique chaos mode.
Theres also a rather fun leveling system, you play, and you level, you don't need to even kill people, you're whole team gets alot of XP that gets to you're XP bar for just playing, this'll help newbies on the way.
Leveling stats can be tricky tho, since there are about 30 things to invest points in, ranging from attackspeed to running speed, and ofcourse power of certain attacks.
Rakion is a decent Action RPG, its a free game so its worth the try if you are into free online games.