Devil Square
Devil Square (often called DS) is an small event (between level 50 and 160) where you can earn exp, gold and drops than the normal world. When joining a Devil Square Event through the NPC Drul´jan (which can be found at Laurum Harbor) you are teleported to a small room. The goal is to survive as many waves of mobs as you can. The difficulty increases as you advance and you can kill other players at wave 5+. Devil Square is not only a great place to earn experience and gold but also to get unique skills, and also corrupted jewels.
There are specific level requirements for each DS (for example only Lvl 90-100). The difficulty of the DS is based on that required level. If you want to join DS, you have to wait for the 20 second long registration period, in that you can choose to join a DS by talking with Drul´jan and clicking on “REGISTER NOW”.