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MapleStory 2nd Thief Advancement Guide
Second Job Advancement - Assassin, Bandit

At level 30, speak with Dark Lord at the Thieves Hideaway in Kerning City and follow his instructions to find your job advancement instructor in 'Construction Site North of Kerning City'. You will then be transported to a map where your objective is to collect 30 Dark Marbles by defeating the monsters. Once you've collected the Marbles, talk to the instructor to get the Proof of a Hero. Take this proof to Dark Lord to advance to your chosen job.