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Be qualified. Enter the Suburbs of Wally’s Castle and kill 9 Jangos. Talk to Echo the Alchemist. Clear the Suburbs of Wally's Castle. Report to Echo.
In order for you to become a Taker, your Raven must have a base level of 15; otherwise, the quest for the Taker path won't appear in your Quest Log.  If you have already done the Taker quest, proceed to part 2. The Quest Log can be opened using the shortcut key, Q. You can also open the Quest Log by clicking the exclamation point (!) at the lower-right side of the screen. A window will appear with a list of on-going and available quests. When you open your Quest Log, make sure you're in a city or town to avoid being attacked by monsters. Just head to Elder Village and enter the Suburbs of Wally's castle under any difficulty.  There is no time limit. The quest can also be done with or without a party. If you're unable to kill 9 Jangos in one dungeon run, you can enter the dungeon again to kill the rest. To get in a dungeon, simply press the Dungeon tab found on your screen. This will open a window, showing you the available dungeons for your level. Click on the dungeon you want to enter and then press Start Dungeon, or hit F8 on your keyboard. This will automatically assign you to a party, but if you're already in a party, choose “Start with current members” instead. To change the dungeon’s difficulty, after choosing the dungeon you want to enter, look at the menu to your right where you can see the description of the dungeon and the dungeon difficulty. You get to choose from Normal, Hard, and Very Hard. Keep in mind that the higher the difficulty you choose, the more stamina is consumed per run, and this also requires a full party to clear the dungeon, depending on the dungeon level. Go back to Elder Village and meet Echo the Alchemist. Echo is the white-haired girl found at the upper-right part of the map, standing a little to the left of the Blacksmith. Echo will explain your next set of quests. Accept the quest and then head out. Under Very Hard mode, clear the Suburb of Wally's Castle to obtain a Secret Letter from the boss. You must also kill at least 18 Bomber Mongs.  There might be a chance that you won't complete the quest in one dungeon run, so keep on entering the same dungeon under the same difficulty. Completing this task with a party is far more easier than doing it solo. Right after you have obtained the Secret Letter and killed 18 Bomber Mongs, return to Elder Village and report to Echo. She will reward you and change Raven's class to Taker.