<Chaos Online> is an AOS game developed by Neoact. It is derived from <Chaos> of <Warcraft 3> and <Chaos> is a Korean version of <DotA> with a bit of changes in rules. Since it supported Korean language many Korean gamers played it instead of <DotA>.
Anyway, <Chaos Online> recently revealed itself through launching OBT.
It generally followed most of features and looks of <Chaos> while enhanced inconvenient systems such as shopping. <Chaos Online>allows the player purchase items instantly no matter where they are while the original game requires the players to utilize a personal storage in order to purchase or move items. And it even provide 8 inventories including 2 exclusive potion slots which are 2 more slots than it used to be and other AOS games usually have.
The most characteristic features of <Chaos> and <Chaos Online> are anti-magic potion and de-spell.
The anti-magic potion prevent most of magic skills for 15 seconds and the de-spell cleanses all the beneficial buffs from foes or all the noxious debuffs from friendly characters.
Besides the system, <Chaos Online> let the players receive 100% experience point when killing a monster together within first 5 minutes so as to encourage early fight and development.