MU Online Castle Siege Guide
Castle Siege is a large guild PvP event where alliances invade or defend the castle. Register through the Guardsman, destroy the castle defenses, control both crown switches and protect the Guild Master while the official seal is completed.
Castle Siege Guide Contents
Overview · Registration · Rules · Castle Defense · Official Seal · Strategy · Life Stone · Siege Potions
Castle Siege Overview
A competing guild must be among the three selected guilds. During registration, participating guilds deliver Sign of Lord items to the Guardsman in Valley of Loren at coordinates 98, 60. The guild holding the official seal when the siege ends becomes the Castle Lord.

How to Register for Castle Siege
| Step | Requirement |
| 1. Find the Guardsman | Go to Valley of Loren, coordinates 98, 60. |
| 2. Register | The guild must belong to an alliance to participate. |
| 3. Compete for Selection | Deliver Sign of Lord items during the registration period. Three guilds are selected. |

Castle Siege Rules
| Rule | Details |
| Official Seal | Only the Guild Master can stamp the official seal. |
| Crown Shield | Two allied characters must control both crown switches. |
| Seal Duration | The Guild Master must accumulate 60 seconds on the pedestal. |
| Interruption | The attempt fails if a switch is released or the Guild Master is killed, pushed or leaves the throne room. |
| Winning Condition | The guild holding the official seal when the siege ends becomes Castle Lord. |
| Combat | Players can attack without pressing Ctrl. Normal damage is reduced during the siege. |
Castle Gates and Guardian Statues
Castle gates have defensive power and durability and can only be attacked during the siege. Weapon durability decreases heavily when attacking gates or statues, so Potion of Bless and Potion of Soul are recommended. Gates and statues can be upgraded through three stages before battle, but cannot be restored or upgraded during combat.
| Defense | Function | Visual |
| Castle Gates | Outer, middle and inner gates block routes to the Dragon Tower. |  |
| Guardian Statues | Destroy all four statues to remove the Dragon Tower shield. They restore nearby HP, MP and AG. |  |
| Defense Layout | Only defenders can cross the Dragon Tower shield while it remains active. |  |
Crown Switches and Official Seal
| Mechanic | Requirement | Visual |
| Crown Switches | Two allied characters must remain on the switches. Moving or killing either holder closes the crown. |  |
| Official Seal | The Guild Master accumulates 60 seconds. Leaving, dying or being displaced resets the time. Each click on the seal removes one accumulated second. |  |
Important: Protect both switch holders and the Guild Master. Losing any one of them can cancel the seal attempt.
Castle Siege Strategy
| Situation | Recommended Action |
| Guild Master | A Dark Lord using Dark Horse is not displaced during the Guild Master Crown Seal. |
| Switch Holders | Stay on the switches and avoid displacement so the crown remains open. |
| Stop Enemy Seal | Target a switch holder or use displacement skills such as Cyclone, Lightning and EarthQuake. |
How to Create and Use a Life Stone
| Required Material | Amount |
| Jewel of Bless | 5 |
| Jewel of Soul | 5 |
| Jewel of Guardian | 1 |
| Jewel of Chaos | 1 |
Create the Life Stone in the Chaos Machine. Only the Guild Master or Assistant Guild Master of an invading team can place it. Placement takes 60 seconds, after which it becomes a guild respawn point and restores HP, MP and AG within three tiles. It can be destroyed and cannot be used by defenders.

Potion of Bless and Potion of Soul
| Potion | Item | Duration | Effect |
| Potion of Bless |  | 120 seconds | Increases damage against gates and Guardian Statues by 20%. It does not increase PvP damage. |
| Potion of Soul |  | 60 seconds | Adds 8 AG recovery, 20 attack speed and 50% defense against Lightning and Ice. |
Castle Siege Quick Reference
Register through the Guardsman at 98, 60 → deliver Sign of Lord items → destroy the gates and four Guardian Statues → control both crown switches → protect the Guild Master during the 60-second official seal → hold the seal when the siege ends.