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I got this information in the game, and I hope it is informative for you, here it is!
In MapleStory for a particular range attack some monsters use certain skills on characters. These may include: Sealing, which locks the players' skills so that they will be barred from using them; Darkness, decreases accuracy of the players; Weakness, which disables the players' jumping ability; and Curse, which halves the experience points of the players. There are, however, ways of countering these. One is by the use of potions while another is by employing the skills of a priest to dispel these effects.
In the game some monsters also have skills to increase or improve their own attributes or those of the other monsters' around them. For example, "Stone Golems" and "Lunar Pixies" can increase their weapon defense while "Fairies" can temporarily increase the defense of their fellow monster.
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