Zen & Ruud

Zen is the game money of MU Online. You buy and sell with it in personal shops, sell unwanted items to NPC merchants for it, and pay many service fees with it. Its amount is shown at the bottom of the inventory.

Some bonuses raise the Zen you pick up from monsters, such as the Excellent option Zen Acquisition Increase and a Muun ability added in Season 10. Older pets such as the Panda and Skeleton also pick up Zen for you.

In the game's story, Ruud is refined by James, one of the twelve apostles who received the power of Lugard, the god of the Continent of MU, and only those who pass Lugard's test can earn it. In practice it comes mostly from the Mastery Box, a reward of the event maps.

• Mastery Boxes come from Chaos Castle, Blood Castle, Devil Square, Illusion Temple, Doppelganger and Empire Guardians: Varka. You must be Master Level or higher to get them.
• Right-click the box and its Ruud is added to your inventory, where it shows under the Zen amount.
• The Monster Soul Converter can also give Ruud as a reward.

Priest James stands in Elbeland (32, 239); the original guide also places him in the Event Square (217, 62). His shop detects your class and only shows items for it. Things you buy from him cannot be sold back for Ruud, but NPC merchants will buy them for Zen.

The official Ruud guide focuses on the sealed Bloodangel set, the first Mastery armor James made. Each class buys its own sealed pieces, then unseals them at the Chaos Goblin by combining a piece with an Ancient Hero's Soul at a 100% rate. The unsealed set can be worn after the 3rd class change.

The guide says the Ancient Hero's Soul is bought with Ruud, and its combination table also shows it made at the Chaos Goblin from an Ancient set item of +11 or higher with an 80% rate.

Every Bloodangel set has the same kind of set bonuses, which grow as you wear 2, 3 and 4 pieces. They include Skill Damage +50, the class's main stat +50, Double Damage chance +10%, Damage (or Magic Damage) +100, Critical and Excellent damage chance +15%, ignoring 5% of enemy defense and All Stats +10.