On April 13, 2011, the town of Arad becomes the target of a massive invasion. From the press release:

"Arad’s population of monsters has grown unwieldy, wreaking havoc across town. Every Thursday and Saturday from 5-6pm Pacific Standard Time, a horde of monsters will creep into various cities in Arad, prompting Dungeon Fighters to team up and fight through the onslaught. Players that succeed will be handsomely rewarded with bonus items and experience, but those who fail will be shunned by the townspeople, who will turn down trade and item repair opportunities for a short period of time. Rewards and penalties will apply to everyone logged in during this period, so teamwork and strategy will be imperative. However, extra rewards will be bestowed upon those that defeat the most monsters."

Upon reaching level 60 and completing certain quests, players will be given the option to choose professions to create better items for battle. Professions include, Alchemy, Enchanting, Disassembly, and Animation.

In addition, players can boost their reputations via the NPC Friendship System; giving gifts to NPCs in exchange for profession-specific items.

Source: Dungeon Fighter Online