How do you get doomknight in AQW?

To obtain the DoomKnight class in AdventureQuest Worlds (AQW), you need to complete a series of quests related to the "DoomKnight" storyline. First, you must reach level 10 and then complete the "DoomWood" questline, which includes defeating various bosses. Afterward, you can purchase the class from the in-game shop for 2,000 Adventure Coins or earn it through special events or promotions. Additionally, you may need to fulfill any specific requirements set by the event if it's temporarily available.