Castle Siege Guide: Tributes, Economy and Castle Profit in MU
Master the Castle Siege economy in MU Online S6: how the tribute system works, how much zen your guild can earn, and how to maximize weekly profits.
Controlling Lorencia Castle is not just a matter of prestige - it is a business. The Castle Siege tribute system generates passive zen week after week, but few Guild Masters know how to maximize that income efficiently. This guide explains the complete castle economy and how your guild can extract maximum value from controlling it.
How the Tribute System Works
When your guild conquers the castle, the Guild Master gains control of the Governor NPC located inside the castle (approximate coordinates: 163, 40 on the Castle Siege map). Through this NPC, you can configure the commerce tax rate for the server.
The Tax Rate
The tax applies to every transaction made in personal stores opened by players on the server. Each time a player buys an item from a store, a percentage of the purchase price is automatically redirected to the Castle Vault.
Tax at 0% -> No income, but popular with players (good political standing)
Tax at 5% -> Balance between income and community acceptance
Tax at 8% -> Recommended maximum to avoid discouraging buyers
Tax at 10% -> High income, but reduces server trading volume
Tax at 15% -> Maximum income, but damages the overall market
Accessing the Castle Vault
The vault accumulates tribute zen automatically. Only the Guild Master and up to 5 designated sub-masters have access. The procedure to access it:
1. Enter Lorencia Castle (portal at Lorencia 130, 85)
2. Access the "Castle Guardian" NPC -> "Castle Vault"
3. The accumulated zen balance is shown at the top of the interface
4. Items can be purchased directly using vault zen
5. Residual zen can be redistributed manually to members
Calculating the Real Castle Profit
Estimates by Server Size
Weekly profit varies directly with trading volume. Use this table as reference:
Small server (50-150 players) -> ~5M to 20M zen/week at 8% tax
Medium server (150-400 players) -> ~20M to 80M zen/week at 8% tax
Large server (400-800 players) -> ~80M to 200M zen/week at 8% tax
Populated server (800+ players) -> 200M+ zen/week at 8% tax
How to Estimate Before Competing for the Castle
Before investing resources in the Castle Siege, estimate the potential profit:
1. Observe the server for 3 days: count how many personal stores are open
2. Estimate the average item price in stores (range: 1M to 50M zen per item)
3. Calculate: (number of stores x estimated transactions/day x avg price) x tax rate
4. Multiply by 7 for the weekly estimate
5. Subtract costs: member potions, gear repairs, registration fee (~10M zen)
What to Buy with Vault Zen
The exclusive castle NPC offers items that normally cost much more on the open market. Know your priorities:
Priority 1: Jewels in Bulk
Buying jewels individually is inefficient. The castle NPC offers packages:
10x Jewel of Bless package -> Average cost: 30M zen (market: ~50M)
10x Jewel of Soul package -> Average cost: 25M zen (market: ~40M)
5x Jewel of Life package -> Average cost: 20M zen (market: ~35M)
3x Jewel of Creation package -> Average cost: 15M zen (market: ~25M)
Priority 2: Box of Kundun
Kundun boxes are the primary source of high-level items. The castle NPC sells level 4 and 5 boxes below market price:
Box of Kundun +4 -> Drops level 4-5 set items, chance for excellent items
Box of Kundun +5 -> Drops level 5-6 set items, higher chance for Excellent options
Priority 3: Set Items with Fixed Options
Some S6 servers allow the castle NPC to sell specific set pieces with pre-defined options. Check availability on your server - if available, prioritize pieces for the guild's tanks (Blade Master) and damage dealers (Grand Master).
Weekly Economic Strategy
Week 1 (First Control): Reinvestment
In the first week with the castle, do not distribute zen - reinvest everything:
Day 1-2 -> Set tax to 8%, let the vault accumulate
Day 3 -> Buy Jewel packages to upgrade core guild member equipment
Day 4-5 -> Distribute boxes to members who contributed most in Castle Siege
Day 6 -> Review main squad gear (minimum +9+DD on everyone)
Day 7 -> Prepare for next Castle Siege defense
Subsequent Weeks: Maintenance and Growth
After the first week, divide profits into three categories:
40% of zen -> War Fund (potions, repairs, next CS registration fee)
35% of zen -> Member equipment upgrades (distributed by merit)
25% of zen -> Reserve fund (protection against losing the castle)
Builds for Holding the Castle
Holding the castle requires continuous defense. The most cost-effective builds:
Full VIT Blade Master (Economic Tank)
For members without elite gear who still need to contribute to defense:
Level 350, Economic Build:
STR: 250 (minimum to equip Dragon Knight Set)
AGI: 100
VIT: 500 (focus on survivability)
ENE: 20
Minimum viable gear:
- Dragon Knight Set +7+DD
- Dragon Slayer Sword +9+Luck
- Shield: Dragon Slayer Shield +7+DD
- Wings: Wing of Dragon (DK L2 Wings, sufficient for defense)
Full ENE Grand Master (Economic AoE Damage)
Level 350, Economic Build:
STR: 50
AGI: 50
VIT: 100
ENE: 700+ (all remaining points)
Minimum viable gear:
- Darkangel Set +7+DD
- Rune Bastard Staff +9+Luck
- Wings: Wing of Soul (DW L2 Wings)
Lord Emperor as Defense Coordinator
Level 380, Support/Control Build:
STR: 150
AGI: 100
VIT: 300
ENE: 150
CMD: 500+ (all remaining points)
High CMD is essential: Summon allows rapidly regrouping scattered
defenders during the chaos of battle.
Gear:
- Darkangel Set +9+DD
- Sword of Destruction +9+Luck
- Wings: Cape of Lord (DL L2 Wings)
Internal Policy: Distributing Earnings Fairly
The leading cause of guild dissolution after winning the castle is poor internal zen management. Implement a transparent system:
Merit Point System
Castle Siege participation (any role) -> 10 points
Confirmed kill in Castle Siege -> 2 points each
Destroying a Statue or Gate -> 5 points
Attendance in 3+ weekly events (DS, BC, CS) -> 5 bonus points
Recruiting a confirmed active member -> 3 points
At the end of each week, distribute zen and items proportionally to accumulated points.
Vault Access Roles
Limit vault access to at most 3 people beyond the Guild Master:
Guild Master -> Full access (set tax rate, purchase, withdraw zen)
Sub-Master 1 -> Purchase access (no zen withdrawal permission)
Sub-Master 2 -> Purchase access (no zen withdrawal permission)
Other members -> No direct access (receive distributions from GM)
Economic Alliance Negotiations
One of the largest indirect income sources from the castle is alliance negotiation. Smaller guilds that cannot contest the castle will often accept deals like:
Agreement Type A (Protection):
- Allied guild does not register candidacy for next Castle Siege
- In return, receives Land of Trials access for 4 days per week
- No share in zen tributes
Agreement Type B (Military Support):
- Allied guild sends 5-8 members to reinforce during the siege
- In return, receives 15% of collected tributes for the week
- Full Land of Trials access
Common Economic Mistakes
Mistake 1: Tax rate too high (15%). Reduces server trading volume, affecting even your own members. Keep it at 8% for balance.
Mistake 2: Not withdrawing accumulated zen. If the castle is lost in the next CS, all vault zen becomes locked. Withdraw regularly.
Mistake 3: Distributing all zen immediately. Without a war fund, the guild lacks resources to pay the next Castle Siege registration fee or restock squad potions.
Mistake 4: Ignoring support members in distribution. The High Elf who stays behind buffing instead of getting kills is still essential. Point systems that ignore support lose those players quickly.
Weekly Economic Checklist
[ ] Tax rate configured (recommended: 8%)
[ ] Withdrawals made on Tuesday and Thursday (never accumulate more than 20% undrawn)
[ ] War fund set aside (minimum 50M zen for potions and registration)
[ ] Point distribution calculated and communicated in guild chat
[ ] Jewels purchased from castle NPC before next CS
[ ] Main squad gear reviewed and repaired
[ ] Active recruitment: at least 25 members ready for next CS
[ ] Alliance agreements documented in screenshots
Controlling the castle with economic intelligence transforms a prestige victory into a sustainable competitive advantage. With the right tax rate, regular withdrawals, and fair distribution, your guild can fund upgrades that perpetuate dominance week after week.
Perguntas frequentes
How does the Castle Siege tribute system work?
The guild that owns the castle sets a tax rate on personal store transactions across the server. The collected zen flows automatically into the Castle Vault, accessible only to the Guild Master and designated sub-masters. The rate ranges from 0% to 15% depending on server configuration.
How much zen can a castle-holding guild earn per week?
It depends on trading volume. On populated servers with 500+ active players, an 8% tax can generate 50 million to 200 million zen per week. On smaller servers with 100-200 players, expect 5 million to 30 million zen weekly.
What can be bought from the Castle Vault NPC?
The internal castle NPC sells Box of Kundun at various levels, Jewel of Bless, Jewel of Soul and Jewel of Life in bulk packages below market price, plus high-level set pieces. Prices are paid in zen directly from the vault balance.
Is it worth holding the castle with a small guild?
Guilds with fewer than 15 active members rarely defend the castle for more than 2 consecutive weeks. The ideal is 25+ active members so the economic return justifies the continuous defense effort.