Throughout the MapleStory world that many boss monsters can be found. Each is located in its own respective map and usually at the end of a very long road or hidden map. Boss monsters spawn less frequently than normal monsters. A "Mushmom" spawns every forty minutes to 1 hour. Even though it is the third weakest among the bosses, Mushmom is very much hard to fight and it is only those players in the level forty and above who attempt to kill it. Other bosses are the "Jr. Balrog", which can be seen at the very end of the Sleepywood Dungeon; "Papulatus", also known as the "Clockboss", can be found at the end of Ludibrium Clock Tower; The "Rombot", also called "Lombard", is the second weakest of all of the bosses and spawns once in every hour.
At level 50 and above that a boss monster is "Zakum" can be found. It has among its arsenal, the ability to attack with ice, fire, lightning, HP(maple story meso) and MP drainage. It can also attack using poison-based weapons. Being a boss, it can summon other monsters as well. It has eight arms, each having a life of its own. As such, players must kill the arms first before attacking its main body. The main body has three forms and it increases in difficulty as you kill each form. Also, each arm is capable of healing all its other parts. Killing bosses may be more difficult, but the gains are greater. Bosses usually drop enormous rewards, such as mushmom spores, zakum helmets and various level(MapleStory powerleveling) 80+ items.
Besides, the newest and most recently added bosses to the Global version of the game, which came with the release of Omega Sector, are the "Chief Gray", and the "MT-09".
