Wrong build? wrong skill increase? No need to worry, in Ragnarok M: Eternal Love you can reset the Skill or Status that you have already entered. There are two items to reset, namely Skill Reset Stick and Status Reset Stone .
You can use this item to reset your skills. Just use it from your inventory and your skill will reset again.
You can use this item to reset the status of your character, but it's not like a reset stick that you just need to use from your inventory. Besides you have to have this item, you must talk to the NPC Processor at Adventure HQ (Job Change Hall) to reset.
Some Quests will give you Reset Items, here is a list quest by rewarding reset items that you can get.