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Balance lab

Class balance

The server numbers, open to everyone: population of each class, damage measured every day with the game's own calculation, the skills players actually use and every adjustment we make, with before and after.

Live◷ Measured daily · Nov 05, 2026 01:24 PM
561Characters
DK 28%DW 43%ELF 16%MG 3%DL 4%SUM 5%RF 2%
561
Characters
111
Developed
37
Online now
55
Progressed this week
9
Changes logged
11/05
Last measurement

Balance board

Is each class balanced?

We compare each character with those at the SAME point of the game (same reset and level bracket: 150-249, 250-349, 350+). Each group's yardstick is the median of the classes, every class weighing the same. 100% = equal to the yardstick. "In the spot" is how you level; "single hit" is bosses and single targets.

WeakBalancedStrongBelow 75% = weak · 75% to 130% = balanced · above 130% = strong
43%
SUM

Summoner

Weak
6 measured
43%
In the spot
56%
Single hit
No reset: 63% · 55+ resets: 13% · 1

Buff under review: raise the main skill base damage or its multiplier.

44%
ELF

Fairy Elf

Weak
13 measured
44%
In the spot
105%
Single hit
No reset: 20% · 81 to 4 resets: 79% · 45+ resets: 100% · 1

Buff under review: raise the main skill base damage or its multiplier.

82%
MG

Magic Gladiator

Balanced
7 measured
82%
In the spot
122%
Single hit
No reset: 80% · 31 to 4 resets: 92% · 15+ resets: 82% · 3

Nothing to do: monitored daily.

97%
DL

Dark Lord

Balanced
9 measured
97%
In the spot
135%
Single hit
No reset: 97% · 51 to 4 resets: 112% · 4

Nothing to do: monitored daily.

124%
DW

Dark Wizard

Balanced
44 measured
124%
In the spot
58%
Single hit
No reset: 176% · 331 to 4 resets: 112% · 35+ resets: 118% · 8

Nothing to do: monitored daily.

124%
DK

Dark Knight

Balanced
25 measured
124%
In the spot
109%
Single hit
No reset: 142% · 181 to 4 resets: 182% · 35+ resets: 88% · 4

Nothing to do: monitored daily.

161%
RF

Rage Fighter

Strong
4 measured
161%
In the spot
84%
Single hit
No reset: 128% · 35+ resets: 390% · 1

Under watch: if it stays above 130%, a nerf follows.

Today, among classes with enough data: 2 below the range (ELF, SUM) and 1 above (RF). Measured on Nov 05, 2026 · 108 measured

Latest change▲ Buff

Dark Knight: stronger Twisting Slash with longer range

Twisting Slash now hits monsters up to 4 tiles away (was 3) and gains 60 base damage (was 0). Also applies to the Master Skill Tree versions.

Twisting Slash: range 3 → 4Twisting Slash: base damage 0 → 60Monsters hit per cast in the spot (average) 3,45 → 5,66DK spot index (simulated) 60% → ≈100%
See the full change →

My character

Is your character balanced?

Type the character name: we show its damage against the average of everyone in the same reset bracket, against its own class, and what can be improved.

Side by side

Class vs class

Pick two classes and compare average damage per character in each bracket, the most used skill and the build.

×
9 (4)
Characters
241 (44)
161%
Index (mid maps)
124%
5
n=5
Average damage per character · In progress (below 150)
2
n=196
395
n=3
Average damage per character · No reset
673
n=33
—
Average damage per character · 1 to 4 resets
1,118
n=3
320,580
n=1
Average damage per character · 5+ resets
111,669
n=8
Dark Side
Most used skill
Evil Spirit
Dark Side
Highest damage skill
Evil Spirit
2.5% / 8.8%
Excellent / critical
0.5% / 23.4%
STR 22%AGI 25%VIT 18%ENE 35%
Average build
STR 12%AGI 24%VIT 5%ENE 60%

Rage Fighter stronger

Damage measurement

Damage per class: in the spot and single hit

Every developed character is measured with the server's own damage calculation, with the stats, gear and skills it has. "In the spot" = damage of ONE use of the skill set in its Helper, with 12 monsters around (how many it hits and how many times, by the game rules). "Single hit" = the highest damage per hit on one target.

Reference monster
Bracket

Phantom Knight · level 96 · defense 425

  1. 1RFRage Fighter80,441
    4 measuredHighest damage skill: Dark SideStrongest: Apocalipse (320,580)
  2. 2MGMagic Gladiator29,210
    7 measuredHighest damage skill: Evil SpiritStrongest: BangueLO (99,685)
  3. 3DWDark Wizard20,885
    44 measuredHighest damage skill: Evil SpiritStrongest: ARCA (245,778)
  4. 4DKDark Knight11,834
    25 measuredHighest damage skill: Twisting SlashStrongest: Gordo (182,638)
  5. 5ELFFairy Elf3,552
    13 measuredHighest damage skill: PenetrationStrongest: Paradox (42,533)
  6. 6DLDark Lord2,236
    9 measuredHighest damage skill: Electric SpikeStrongest: DLicio (16,079)
  7. 7SUMSummoner1,837
    6 measuredHighest damage skill: Lightning ShockStrongest: LizFoley (10,156)

Measured on Nov 05, 2026 01:24 PM · 108 measured · 3,000 simulated hits per skill

In the spot (mean) · Single hit
ClassHell Spider
defense 60
Satyros
defense 280
Blue Golem
defense 277
Phantom Knight
defense 425
Twin Tale
defense 865
Balram
defense 885
Exc / Critical
Dark Knight
25 measured
17,006
2,516
13,486
1,911
13,574
1,924
11,834
1,620
8,803
1,180
8,726
1,169
2% / 18.8%
Dark Wizard
44 measured
25,249
1,880
22,148
1,633
22,156
1,641
20,885
1,523
18,790
1,349
18,734
1,345
0.5% / 23.4%
Fairy Elf
13 measured
4,502
2,455
3,828
1,991
3,865
2,000
3,552
1,788
3,134
1,513
3,122
1,491
1.5% / 17.7%
Magic Gladiator
7 measured
35,004
4,162
31,357
3,686
31,283
3,684
29,210
3,359
24,933
2,846
24,684
2,841
4.3% / 15.7%
Dark Lord
9 measured
4,225
1,821
2,985
1,253
2,996
1,257
2,236
902
1,177
297
1,162
288
1.1% / 23.3%
Summoner
6 measured
3,581
630
2,374
390
2,354
389
1,837
280
1,205
181
1,190
179
1.7% / 20.8%
Rage Fighter
4 measured
102,381
15,568
88,436
13,467
88,879
13,506
80,441
12,111
58,134
8,611
57,383
8,390
2.5% / 8.8%

What players pick

Most used skills

What players keep configured in the MU Helper (main skill plus the two activation skills). It is the most faithful picture of what is used to level up.

248 characters with the Helper configured

  1. 1
    Evil SpiritDW
    43
  2. 2
    Twisting SlashDK
    30
  3. 3
    Triple ShotELF
    28
  4. 4
    Energy BallDW
    26
  5. 5
    Crescent Moon SlashDK
    19
  6. 6
    StarfallELF
    18
  7. 7
    LightningDW
    13
  8. 8
    MeteoriteDW
    12
  9. 9
    TwisterDW
    12
  10. 10
    Fire BurstDL
    10
  11. 11
    FlameDW
    10
  12. 12
    Power WaveDW
    10
  13. 13
    Fire BallDW
    8
  14. 14
    ImpaleDK
    6
  15. 15
    CycloneDK
    5

Dark Knight

  • Twisting Slash28
  • Crescent Moon Slash19
  • Cyclone5

Highest damage skill: Twisting Slash

Dark Wizard

  • Evil Spirit38
  • Energy Ball26
  • Lightning13

Highest damage skill: Evil Spirit

Fairy Elf

  • Triple Shot28
  • Starfall18
  • Multi-Shot5

Highest damage skill: Penetration

Magic Gladiator

  • Evil Spirit5
  • Mana Rays3
  • Power Slash2

Highest damage skill: Evil Spirit

Dark Lord

  • Fire Burst10
  • Fire Blast4
  • Fire Scream3

Highest damage skill: Electric Spike

Summoner

  • Lightning Shock5
  • Chain Lightning4
  • Pollution4

Highest damage skill: Lightning Shock

Rage Fighter

  • Dark Side4
  • Charge1
  • Dark Side Strengthener1

Highest damage skill: Dark Side

Day by day

Damage trend per class

Mean best hit against the selected monster, one measurement per day. Vertical lines mark balance changes.

077,200154,400231,601308,80110/2310/2510/2710/2910/3111/0211/04Dark Knight: stronger Twisting Slash with longer rangeDark Knight: Crescent Moon Slash hits a larger areaDark Knight: Twisting Slash and Crescent Moon Slash hit more monstersRage Fighter: stronger Dark Side, 8 targets and bigger radiusDark Side, Dragon Roar, Infinity Arrow and Expansion of Wizardry unlocked earlyDark Side: extra targets around the chosen monster

X-ray

The 7 classes today

Live count from the game database (no test or GM accounts). The average build only counts developed characters.

DW

Dark Wizard

241
43% of the server
43 developed13 online18 progressed this week
66
Average level
1.4
Average resets
90
Reset record

Average build

STR 12%AGI 24%VIT 5%ENE 60%
Dark Wizard 213Soul Master 23Grand Master 5
In the spot · Phantom Knight20,885
Favourite Helper skillEvil Spirit
Most advancedZunlock · 90R 340
DK

Dark Knight

155
27.6% of the server
24 developed9 online10 progressed this week
63
Average level
0.7
Average resets
40
Reset record

Average build

STR 54%AGI 30%VIT 8%ENE 8%
Dark Knight 142Blade Knight 10Blade Master 3
In the spot · Phantom Knight11,834
Favourite Helper skillTwisting Slash
Most advancedGordo · 40R 364
ELF

Fairy Elf

89
15.9% of the server
18 developed6 online11 progressed this week
80
Average level
3.2
Average resets
118
Reset record

Average build

STR 12%AGI 41%VIT 10%ENE 37%
Fairy Elf 78Muse Elf 8High Elf 3
In the spot · Phantom Knight3,552
Favourite Helper skillTriple Shot
Most advancedParadox · 118R 85
SUM

Summoner

28
5% of the server
6 developed1 online2 progressed this week
87
Average level
0.6
Average resets
11
Reset record

Average build

STR 13%AGI 27%VIT 8%ENE 52%
Summoner 21Bloody Summoner 7
In the spot · Phantom Knight1,837
Favourite Helper skillLightning Shock
Most advancedMeretriz · 11R 99
DL

Dark Lord

20
3.6% of the server
9 developed4 online5 progressed this week
155
Average level
0.7
Average resets
5
Reset record

Average build

STR 37%AGI 27%VIT 5%ENE 22%CMD 10%
Dark Lord 20
In the spot · Phantom Knight2,236
Favourite Helper skillFire Burst
Most advancedImperador · 5R 10
MG

Magic Gladiator

19
3.4% of the server
7 developed3 online6 progressed this week
150
Average level
8.6
Average resets
115
Reset record

Average build

STR 29%AGI 35%VIT 7%ENE 29%
Magic Gladiator 16Duel Master 3
In the spot · Phantom Knight29,210
Favourite Helper skillEvil Spirit
Most advancedTIAODOGAS · 115R 397
RF

Rage Fighter

9
1.6% of the server
4 developed1 online3 progressed this week
171
Average level
9.3
Average resets
84
Reset record

Average build

STR 22%AGI 25%VIT 18%ENE 35%
Rage Fighter 8Fist Master 1
In the spot · Phantom Knight80,441
Favourite Helper skillDark Side
Most advancedApocalipse · 84R 400

Where each class is

Level 1-99
429
Level 100-249
50
Level 250+
44
1-4 resets
16
5-9 resets
3
10+ resets
19

Real tests

Real tests on the training dummy

Hit the Training Dummy in the combat square in Lorencia (center of the map) with your skills. When you stop hitting, the result of each skill shows in chat and is recorded here, so classes, builds and balance changes can be compared over time. Only skills with 5 or more hits are recorded. Tests are kept for 90 days.

WhenCharacterSkillAverageMaxDmg/sCritExcTarget defense
Oct 27, 07:48 PMDaiamSM0R 375Evil Spirit23341154525%0%277
Oct 27, 07:45 PMVeronikaME0R 361Penetration52475670722%0%277
Oct 27, 06:53 PMApocalipseFM20R 343Dark Side8,1979,38025,26111%0%277
Oct 27, 06:52 PMMeretrizBS6R 340Pollution7641,30661025%0%277
Oct 27, 06:52 PMMeretrizBS6R 340Pollution53172370634%0%277
Oct 27, 06:52 PMMeretrizBS6R 340Lightning Shock1,1031,3961,47140%0%277
Oct 27, 06:52 PMMeretrizBS6R 340Chain Lightning1,2632,1386,55129%0%277
Oct 27, 06:50 PMMeretrizBS6R 340Pollution1,0071,3061,23842%0%277
Oct 27, 06:50 PMMeretrizBS6R 340Ataque básico28451517620%0%277
Oct 27, 06:50 PMMeretrizBS6R 340Chain Lightning1,2522,1382,64737%0%277
Oct 27, 06:50 PMMeretrizBS6R 340Lightning Shock1,8392,22855835%0%277
Oct 27, 06:41 PMApocalipseFM20R 343Dragon Roar4,4346,93321,21721%0%277
Oct 27, 06:41 PMApocalipseFM20R 343Chain Drive8,3839,33839,84822%0%277
Oct 27, 06:40 PMApocalipseFM20R 343Chain Drive8,3989,55137,50420%0%277
Oct 27, 06:40 PMApocalipseFM20R 343Dark Side29,05932,68577,2396%0%277
Oct 27, 06:40 PMApocalipseFM20R 343Dragon Roar5,7578,03111,04925%0%277
Oct 27, 06:40 PMApocalipseFM20R 343Chain Drive2,7213,9643,68420%0%277
Oct 27, 06:40 PMApocalipseFM20R 343Dark Side10,57214,83215,15218%0%277
Oct 27, 06:39 PMApocalipseFM20R 343Dark Side8,52612,78526,45825%0%277
Oct 27, 06:39 PMApocalipseFM20R 343Chain Drive2,0452,8819,97626%0%277
247 tests

Damage per second = total damage ÷ time between the first and last hit of the skill. Everyone hits the same target (same defense), so the numbers are comparable.

Balance notes

Change log

Every class or skill adjustment that goes live, with the reason and the before and after numbers.

Class
Type
  1. ▲ BuffDK

    Dark Knight: stronger Twisting Slash with longer range

    Twisting Slash now hits monsters up to 4 tiles away (was 3) and gains 60 base damage (was 0). Also applies to the Master Skill Tree versions.

    BeforeAfter
    Twisting Slash: range3→4tiles
    Twisting Slash: base damage0→60
    Monsters hit per cast in the spot (average)3,45→5,66
    DK spot index (simulated)60%→≈100%
    Details →
  2. ▲ BuffDK

    Dark Knight: Crescent Moon Slash hits a larger area

    Crescent Moon Slash now also hits the monsters up to 2 tiles from the target (was 1). Damage per hit did not change: the DK is still far behind the other classes in the spot.

    BeforeAfter
    Crescent Moon Slash: area around the target3×3→5×5tiles
    Monsters hit per cast in the spot (average)1,4→≈2,6
    Damage per hitsame→same
    Details →
  3. ▲ BuffDK

    Dark Knight: Twisting Slash and Crescent Moon Slash hit more monsters

    Twisting Slash now reaches 3 tiles (was 2) and Crescent Moon Slash also hits the monsters 1 tile from the target. Damage per hit did not change: the gain is in area, where the DK was far behind.

    BeforeAfter
    Twisting Slash reach2→3tiles
    Crescent Moon Slash: monsters hit per casttarget only→target + those within 1 tile
    Damage per hit of both skillssame→same
    Details →
  4. ▲ BuffRF

    Rage Fighter: stronger Dark Side, 8 targets and bigger radius

    Dark Side gained 80 base damage, hits up to 8 monsters (was 5) and looks for targets within 5 tiles (was 4). The top Rage Fighter now ties with the top Soul Master on mid-level maps.

    BeforeAfter
    Dark Side base damage0→80
    Monsters hit per cast5→8
    Target search radius4→5tiles
    Hits on each target2→2
    Details →
  5. ◆ AdjustmentRFELFDW

    Dark Side, Dragon Roar, Infinity Arrow and Expansion of Wizardry unlocked early

    The minimum level to learn and use four skills dropped: the RF gets Dark Side and Dragon Roar at level 20; the Elf gets Infinity Arrow and the DW gets Expansion of Wizardry at level 10.

    BeforeAfter
    Dark Side (RF)180→20level
    Dragon Roar (RF)150→20level
    Infinity Arrow (Elf)220→10level
    Expansion of Wizardry (DW)220→10level
    Details →
  6. ✚ FixMG

    Duel Master: Master Tree Ice Strengthener works again

    The Duel Master ice strengthener disappeared from the tree after being learned and added no damage. Fixed on the server; the Master screen now also shows each skill's real values.

    BeforeAfter
    Ice Strengthener (DM)—→✓
    Values on the Master screen0,60 %→+60 %
    Details →
  7. ✚ FixDWELFDLSUM

    Off-hand weapon only for DK, MG and RF

    As in the original MU, only Dark Knight, Magic Gladiator and Rage Fighter can wield a weapon in each hand. DW/SM, Elf, DL and Summoner can no longer equip a second staff or weapon.

    BeforeAfter
    Dual weapons: DW/SM, Elf, DL, Summoner✓→—
    Dual weapons: DK, MG, RF✓→✓
    Details →

Decision of the week

Buff and nerf candidates

The exact numbers behind the board: index in the spot and single hit, how many characters, per reset bracket and the change against 7 days ago. This is where the weekly decision comes from.

ClassIndex · In the spotvs 7 daysIndex · Single hitNBy bracket (index · N)Reading
Summoner43.3%-57 pp56.1%6No reset: 63% · 55+ resets: 13% · 1Buff candidate
Fairy Elf43.8%+12 pp104.5%13No reset: 20% · 81 to 4 resets: 79% · 45+ resets: 100% · 1Buff candidate
Magic Gladiator81.9%-181 pp121.6%7No reset: 80% · 31 to 4 resets: 92% · 15+ resets: 82% · 3Watch
Dark Lord97.0%+7 pp134.5%9No reset: 97% · 51 to 4 resets: 112% · 4Balanced
Dark Wizard123.6%+13 pp58.2%44No reset: 176% · 331 to 4 resets: 112% · 35+ resets: 118% · 8Watch
Dark Knight123.9%+63 pp109.0%25No reset: 142% · 181 to 4 resets: 182% · 35+ resets: 88% · 4Watch
Rage Fighter161.0%-213 pp84.3%4No reset: 128% · 35+ resets: 390% · 1Nerf candidate

The index is damage per hit. Before deciding, also check area skills, attack speed and PvP.

Transparency

How we measure

Every hour we copy each character's stats, gear (options, level, excellent options, sets), skills and MU Helper setup from the game database and run the server's own damage calculation: the same code that decides the number you see on screen. Once a day, before dawn, everyone is measured again.

Each attack skill is tested 3,000 times against six reference monsters, counting misses, excellent and critical hits. "In the spot": 12 monsters around the character in a 13×13 tile square; we count how many hits each skill delivers per use (range, cone, target area, extra hits by distance, Dark Side's 8 targets × 2...) and multiply by the per-hit damage of the skill the player keeps in the Helper.

The comparison is always with those at the same point: same reset and level bracket. The yardstick is the median of the classes, every class weighing the same; just-reset characters (below 150) and support elves (Energy as the highest stat) are left out.

Not included yet: attack speed (uses per second), pets, party buffs and PvP. With monsters standing still and spread out, short-range skills come out a bit below what they do when monsters come to you.

We compare each character with those at the SAME point of the game (same reset and level bracket: 150-249, 250-349, 350+). Each group's yardstick is the median of the classes, every class weighing the same. 100% = equal to the yardstick. "In the spot" is how you level; "single hit" is bosses and single targets.

FAQ

What is the strongest MU Online class on OpenMU today?
In the Nov 05, 2026 measurement, comparing characters of the same reset bracket, the highest damage per hit on a mid-level map comes from Rage Fighter (161%) and Dark Knight (124%). Furthest below average is Summoner (43%). 100% is the bracket average.
What is the most played class?
The server has 561 characters right now. The classes with the most players are Dark Wizard (241), Dark Knight (155), and Fairy Elf (89).
What is the balance index?
It is a class average damage per character divided by the average of all characters in the same reset bracket. Below 75% the class is weak, above 130% it is strong. With fewer than 4 characters the number does not decide anything yet.
How is damage measured?
With the server's own damage formula: the stats, gear and skills of every character are tested thousands of times against six reference monsters, from Hell Spider to Balram.
Does the balance change often?
Only when the numbers show a big gap. Every change is logged in the history with before and after.
Can I suggest an adjustment?
Yes, on our Discord. Every suggestion is measured with these same numbers before it becomes a change.

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