Zen is the main and most common currency in MU Online.

• Obtained by hunting monsters
• Earned by selling items to NPC shops
• Can be freely traded between players

Ruud is a special currency used to purchase items and skills from Priest James.

• Bound currency (cannot be traded)
• Obtained from event maps
• Rewarded from in-game events
• Found in Mastery Boxes

Jewels play an important role in character progression.

• Used to upgrade equipment
• Required for crafting powerful weapons
• Needed for creating event tickets