Last updated: August 28, 2026

On this page: The Event · Weekly Rotation · Entering · The Four Zones · Every Monster · How It Scales · Drops · Experience · Strategy · FAQ

MU Online Imperial Guardian – Imperial Fortress Event Guide

The Imperial Guardian event — the Imperial Fortress, sometimes written Empire Guardian — arrived with Season 6 Episode 3 and is still the toughest scheduled party content on most Season 6 servers. You take an invitation into a walled fortress, smash through gates defended by imperial troops, and kill the commander holding the final zone before the clock runs out.

Everything on this page — monster statistics, the day-by-day rotation, the timers and all three drop tables — is read out of a stock Season 6 Episode 3 server package, so it matches what you will meet on a server running default settings.

The Event at a Glance

	Detail
Added in	Season 6 Episode 3
Maps	Four dedicated fortress maps (server maps 69–72)
Zones per run	3 on weekdays, 4 on Sunday
Standby time	180 seconds before the first round starts
Time per round	600 seconds (10 minutes)
Loot lock	20 seconds before another player can take your drop
Sunday invitation mix	1 000 000 zen
Final boss	Gaion Kharein (Sunday only)

The Weekly Rotation

The fortress is not the same fight every day. Each weekday spawns its own set of officers and one named commander in the last zone; Sunday replaces the whole layout with a four-zone run that ends against Gaion Kharein. Six different weekday commanders rotate across the six weekdays.

Day	Zones	Commander(s)	Guards
Monday	3	Destler	20
Tuesday	3	Vermont	20
Wednesday	3	Kato	20
Thursday	3	Galia	20
Friday	3	Erkanne	20
Saturday	3	Raymond	20
Sunday	4	Erkanne, Raymond, Jerint, Gaion Kharein	37

Note the pairing: Monday and Thursday share the same officers but end on Destler and Galia; Tuesday and Friday end on Vermont and Erkanne; Wednesday and Saturday end on Kato and Raymond. Sunday is the only day that fields Jerint and Gaion Kharein.

Entering the Fortress

Each weekday has its own invitation, which is what gates the event — you cannot simply walk in. The Sunday invitation is not a drop: it is mixed at the Chaos Machine from the weekday invitations, and in the stock configuration that mix also takes 1 000 000 zen.

Once inside, the server gives the party 180 seconds of standby before the first round begins. From then on each zone is a timed attack: 10 minutes to destroy the gate, clear the guards and move on. Miss the timer and the run ends where you stand.

The Four Zones

The fortress is four separate maps. A weekday run uses the first three; the Sunday run uses all four. Each zone is sealed by gate monsters that have to be destroyed before the party can advance — they have no attack at all, they are simply walls with 500 to 600 hit points.

A weekday run (Monday shown)

Zone	Commander	Garrison	Gates
Zone 1	—	Knights ×3, Medic ×3, Quartermaster ×1	3
Zone 2	—	Combat Instructor ×1, Medic ×3, Shield Bearer ×3	3
Zone 3	Destler	Bodyguard ×3, Medic ×3	1

The Sunday run

Zone	Commander	Garrison	Gates
Zone 1	Erkanne	Bodyguard ×3, Medic ×3, Shield Bearer ×3	3
Zone 2	Raymond	Bodyguard ×3, Medic ×3, Shield Bearer ×3	3
Zone 3	Jerint	Bodyguard ×3, Medic ×3, Shield Bearer ×3	3
Zone 4	Gaion Kharein	Bodyguard ×4, Medic ×3, Shield Bearer ×3	1

Every Monster in the Fortress

Commanders

Gaion Kharein is the Sunday finale. The other seven are the named commanders that hold the last zone on a weekday — tougher than anything else on the map and the only monsters that use the boss drop table.

Monster	Base HP	Damage	Defense	Attack rate
Gaion Kharein	1 250	45–50	35	91
Jerint	930	42–47	30	80
Raymond	800	39–44	28	70
Erkanne	800	39–44	28	70
Destler	780	36–41	27	70
Vermont	780	36–41	27	70
Kato	780	36–41	27	70
Galia	780	36–41	27	70

Officers

One officer stands behind each gate. They are the mid-tier obstacle: not as dangerous as a commander, but they hit considerably harder than the rank and file and they are what usually stalls an under-geared party against the clock.

Rank and file

Three guards of each type stand in every zone. The Medic is the one to focus first — it has the lowest health of the four and, as the name suggests, it is there to keep the rest of the garrison standing.

Monster	Base HP	Damage	Defense	Attack rate
Quartermaster	650	33–38	22	50
Combat Instructor	650	33–38	22	50
Knight Commander	650	33–38	22	50
Grand Wizard	650	33–38	22	50
Master Assassin	650	33–38	22	50
Cavalry Captain	650	33–38	22	50
Shield Bearer	580	30–35	20	30
Medic	500	25–30	15	30
Knights	550	28–33	17	30
Bodyguard	570	30–35	18	30

How the Fortress Scales to You

This is the part most guides miss. Imperial Guardian does not use the flat statistics from the monster list. The server keeps a table of multipliers indexed by your own level and applies them on the spot, which is why the event is still dangerous at level 400 and why a high-level character cannot simply carry a low-level party through it.

Your level	Level ×	HP ×	Damage ×	Gaion HP	Gaion damage
191–200	×64	×500	×22	625 000	990–1 100
291–300	×85	×1000	×32	1 250 000	1 440–1 600
391–400	×105	×1800	×42	2 250 000	1 890–2 100
491–500	×125	×1900	×47	2 375 000	2 115–2 350
591–600	×145	×2000	×53	2 500 000	2 385–2 650
791–800	×154	×2200	×57	2 750 000	2 565–2 850

The multipliers run in 80 brackets from level 0 all the way to 800, so master-level characters keep meeting a fortress that grows with them. Defence and attack rate scale alongside health and damage.

Rewards

Three separate drop tables are in play, and they are what make the Sunday run worth the mix cost. All three are split into five level brackets; the tables below show the 301–400 bracket, which is where most Season 6 characters sit.

Gaion Kharein — the Sunday boss table

3 items per kill, 1 000 000 zen, and an excellent option roll on 40% of drops — four times the rate of the weekday commanders. 119 different items can appear.

Item	Type	Chance	Can roll excellent
Jewel of Chaos	Wings, orbs & spheres	2.000%	yes
Jewel of Creation	Jewels & misc	1.800%	yes
Book of Neil	Staffs	1.710%	yes
Lord Scepter	Maces & scepters	1.519%	yes
Demonic Stick	Staffs	1.510%	yes
Great Scepter	Maces & scepters	1.509%	yes
Jewel of Soul	Jewels & misc	1.500%	yes
Great Reign Crossbow	Bows & crossbows	1.315%	yes
Celestial Bow	Bows & crossbows	1.306%	yes
Jewel of Bless	Jewels & misc	1.200%	yes
Rune Blade	Swords	1.141%	yes
Staff of Destruction	Staffs	1.133%	yes
Adamantine Boots	Boots	1.093%	yes
Adamantine Gloves	Gloves	1.092%	yes
Adamantine Pants	Pants	1.092%	yes
Adamantine Armor	Armour	1.092%	yes
Dark Steel Boots	Boots	1.091%	yes
Dark Steel Gloves	Gloves	1.091%	yes

General drops — weekday commanders and officers

The weekday commanders and their officers roll from the same item pool as Gaion Kharein — the difference is quantity, not quality. You get 2 items instead of 3, 400 000 zen instead of 1 000 000, and an excellent roll on 10% of drops instead of 40%. Top of the table:

Item	Type	Chance	Can roll excellent
Jewel of Chaos	Wings, orbs & spheres	2.000%	yes
Jewel of Creation	Jewels & misc	1.800%	yes
Book of Neil	Staffs	1.710%	yes
Lord Scepter	Maces & scepters	1.519%	yes
Demonic Stick	Staffs	1.510%	yes
Great Scepter	Maces & scepters	1.509%	yes
Jewel of Soul	Jewels & misc	1.500%	yes
Great Reign Crossbow	Bows & crossbows	1.315%	yes
Celestial Bow	Bows & crossbows	1.306%	yes
Jewel of Bless	Jewels & misc	1.200%	yes

Stone statues

The statues scattered through the fortress are a small side reward — almost always an Imp, occasionally a jewel. Worth breaking on the way past, not worth a detour.

Item	Type	Chance	Can roll excellent
Imp	Pets, rings & misc	91.999%	—
Jewel of Chaos	Wings, orbs & spheres	4.000%	—
Jewel of Creation	Jewels & misc	1.600%	—
Jewel of Soul	Jewels & misc	1.200%	—
Jewel of Life	Jewels & misc	0.800%	—
Jewel of Bless	Jewels & misc	0.400%	—
Bundle of Jewel of Soul	Wings, orbs & spheres	0.001%	—
Bundle of Jewel of Bless	Wings, orbs & spheres	0.000%	—

Experience for the Final

Clearing the last zone pays a flat experience reward scaled to your level, on top of everything killed on the way there.

Your level	Experience for clearing the final
291–300	440 000
391–400	540 000
491–500	640 000
591–600	740 000
691–700	840 000
791–800	940 000

Strategy

• Bring a full party of similar level. The scaling reads each player's level, so a mixed party makes the fortress harder for the low-level members without making it easier for anyone.
• Kill the Medics first. Four guard types, and the Medic is the weakest at 500 base HP — leaving it alive prolongs every other fight.
• The gates have no attack. Castle Gates deal zero damage. Ignore them while guards are alive, then burn them down; they are pure hit points between you and the next zone.
• Watch the round timer, not the boss health bar. 10 minutes per zone is generous for a geared party and impossible for an under-geared one. If the gate is not down at the halfway point you will not finish.
• Save invitations for Sunday. The weekday runs exist mainly to feed the Sunday mix. Three items at 40% excellent is worth far more than three separate weekday runs.

FAQ

What is the Imperial Guardian event in MU Online?

Imperial Guardian, also called the Imperial Fortress, is a party event added in Season 6 Episode 3. You enter a fortress map with an invitation, break through gated zones full of guards, and kill the commander waiting in the last zone before the timer runs out. There is a different commander every day of the week, and on Sunday the run is longer and ends against Gaion Kharein.

How do I get an Imperial Guardian invitation?

Each weekday drops its own invitation. The Sunday invitation is not dropped — you mix the weekday invitations together at the Chaos Machine, and in the stock Season 6 configuration that mix also costs 1 000 000 zen.

How long does an Imperial Guardian round last?

The server waits 180 seconds for players to gather, then each attack round runs for 600 seconds — 10 minutes per zone. Items dropped for another player are locked to them for 20 seconds before anyone else can pick them up.

Do the Imperial Guardian monsters get harder as I level?

Yes. The event does not use the flat stats from MonsterList.xml. Every monster is multiplied by a bracket taken from your own level, so a level 400 character faces monsters with 1 800 times the base HP while a level 200 character faces 500 times. That is why the fortress never becomes trivial.

What does Gaion Kharein drop?

The Sunday boss uses its own table with 119 possible items in the 301–400 bracket. It drops 3 items per kill against 2 from the weekday commanders, pays 1 000 000 zen, and rolls excellent options at 40% instead of 10%.

Is Imperial Guardian worth doing on a private server?

On a Season 6 server it is one of the few repeatable sources of guaranteed excellent gear with a boss table behind it. The Sunday run in particular gives three items at a 40% excellent rate plus 1 000 000 zen, which on a low-rate realm is a meaningful week's income.

Continue Reading

Guide	Why it helps
Season 6 guide	The season that added this event, with every map and the full event clock.
Doppelganger	The other Episode 3 invitation event.
Chaos Machine	Where the Sunday invitation is mixed.
Excellent options	What the excellent roll on those drops actually gives you.
Selupan	The other Season 6 boss worth organising a party for.