MU Online Season 10 Guide

Most of these guides are archaeology. This one is not. The currency your event rewards are paid in, the window you apply for events from, the gear tier that ends ordinary armour, the fifth pentagram slot and the skill bar your helper reads back were all built in 2015, and all of it is still live on a Season 22 server. So this page is not sorted into Part 1, 2 and 3, but by how often you touch the thing.

Season 10 sorted by how much of it you still touch

Nothing here was removed. The split is between systems you use without thinking and ones climbed over so often that Season 10's version is now the floor, not the ceiling.

The furniture you use every day: the Plaza, the boxes, the Case

You used to apply for an event in the right town at the right NPC. One place took that over, and you still use it: reach the Event Map Plaza from the move command window (M) for 20,000 zen, or click the notification icon when an event opens. The old town NPCs no longer accept applications, which is the commonest reason a returning player thinks an event was deleted.

Eight desks share the Plaza, and entry requirements were flattened into shared level bands, so the four main events read identically below.

Those are the official 2015 times; private servers rewrite timetables, and ours runs events and mini-bosses all day. The bands matter more: the same event at level 50 and at 400 is two different fights.

Mastery Boxes, and why you sometimes finish an event with nothing

Boxes are not handed out at the door. They are paid into the Gremory Case when the event ends, only to characters at master level or above, and graded on your own contribution. Too little, and you get nothing even on a successful run.

One exception, and it is why energy elves get invited: an elf with 1,500 or more energy is credited with the party's average instead of her own.

Ruud: the currency that outgrew its own patch

Ruud was introduced to buy sealed Blood Angel pieces and is now the game's general event currency. Earning it works as Season 10 set up: it comes out of Mastery Boxes, which come out of Chaos Castle, Blood Castle, Devil Square, Illusion Temple, Doppelganger and Vulcanus. There is no other tap.

It sits at the bottom of your inventory (I) like a second zen counter and behaves nothing like it: it is welded to the character that earned it.

Pick your main before you grind events: Ruud earned on an alt is stuck there.

Everything on his shelf is sealed, and sealed pieces cannot be worn. He shows one set, for the class talking to him.

Blood Angel: the bottom rung of the mastery ladder

This is the part that moved most. Blood Angel was built as endgame armour for level 400 characters past their third class change, and that is still where you meet it — except endgame has climbed several tiers, so it is now the first mastery set you own rather than the last. The mechanic was kept and the numbers raised.

Three grades: two farmed, one bought.

Unsealing, and the ancient sets you were about to throw away

A sealed piece needs a Soul of the Ancient Hero, made at the Chaos Goblin from an ancient set upgraded to +11 or higher, weapons and accessories excluded. That combination passes 80% of the time. Soul plus sealed item then unseals at a flat 100%, and the piece equips and counts toward the set bonuses.

Budget for that first step: four pieces means four Souls at 80% each. On our server the custom jewel system is where the upgrading happens.

What the four pieces buy you

Bonuses stack, and three pieces to four is where the set stops being armour and becomes a build.

Every mastery piece also carries one exclusive stat option worth 15–30 to one stat or 7–15 across all of them, and excellent mastery armour rolls from its own pool.

The Grow Lancer, if you want to play her

Part 1 added the third female class, and the only one with two separate damage pools. The second class change makes her a Grow Lancer, the third a Mirage Lancer.

Both pools feed her skill damage, so neither a pure strength nor a pure agility build wastes anything.

Her skills, in the order you unlock them

The gate is the unusual part: her skills come from scrolls with stat requirements, not level requirements, so you can be past the level and still locked out for spreading your points. Ordered below by when you get each one, gate in place of level.

Magic Pin's 300/300 double gate is the most expensive unlock in the kit, and Circle Shield is the only one behind a quest, so if it never appears you missed Marlon.

Her gear ladder

Six lances in two speed classes, paired at near-identical drop levels. The choice at every rung is Wrath damage from the faster lance against Punishment from the slower.

Three armour lines cover the curve, with two shields alongside; on high exp you pass all three in an evening.

The capes are her signature slot: she pays life for damage as a standing cost of attacking.

The master skill window, and the numbers that have moved since

Part 1 rebuilt the master trees for all seven existing classes at once. The layout you still use, ranks 7 to 9, and the rule that mana and AG costs climb with a skill's grade all date from here. The values do not.

Two baseline changes set the pattern: stat nodes went from 12 to 14 points per investment, cap 90 to 108, and durability reduction from 12% to 18%, cap 90% to 135%. Damage nodes were lifted in the same pass — Blood Storm's cooldown halved from 10 seconds to 5, to 3 strengthened, its strengthener going 5 to 11; Hellfire and Ice strengtheners 6 to 14; the Dimension Master's Drain Life mastery 12 to 102 against a cap of 766.

The nodes that changed how classes defend

The durable half is defensive, and it introduced feedback you still read in combat: Parry, Absorb and Block popping over your character are Season 10 nodes firing. Shared nodes and class additions are listed together, since one pool of points buys both.

Mirage Lancer's three branches

Her tree splits three ways, and the branch you commit to decides what she is for. Tenacity hides the best single node in it: Fury mastery removes Fury's defence penalty, turning a trade-off into a free buff.

The elemental layer you will actually touch

Part 3 was the quiet one, and it shapes how a level 400+ character gears today.

The fifth slot and the Errtel of Radiance

The Errtel of Radiance is the fifth errtel and goes in the fifth pentagram slot, which ships locked. Open it with a Radiance Slot Expansion Scroll — four Radiance Slot Fragments combined, or pulled whole from an Elemental Capsule — then right-click the pentagram in your inventory and click the slot. There is no NPC to hand it to.

Rank decides what the slot gives you, and the progression is not smooth: rank 1 is numbers, rank 2 survivability, rank 3 crowd control and the reason to open it.

A rank-up switches on one option of the new rank at random, and you can only rank up once every activated option sits at +7.

Skill imprinting, and why your helper ignores half your bar

Register a skill and, when its element matches your equipped pentagram's, it gains extra skill attack power, scaled by the pentagram's upgrade level and the errtels in it. Imprinted skills are marked in the icon corner.

Ten slots: five basic skills on hotkeys 1 to 5 and five special skills — siege skills and the Dark Lord's Dark Spirit commands — on 6 to 0. Special skills get no elemental bonus. The part that catches everybody: the MU Helper only casts skills you have imprinted, so changing an imprint silently reconfigures your AFK farming, which on high exp is most of your levelling.

Combination and dismantling

Elemental crafting moved to NPC Adniel — Elbeland (37, 215) and Acheron (38, 216) — in a window that previews the outcome, keeps materials registered between attempts, and drops the result into the Gremory Case rather than failing on a full inventory. Every recipe got simpler at the same time.

Elemental Runes come from the town NPCs Amy, Fairy Lara, Silvia and Isabel, and from Elemental Capsules. The count climbs with level and rank, from one rune at rank 1 level 1 to 11 at rank 3 level 10.

Dismantling is the half nobody uses enough. Set items and errtels break down from the inventory for 1 Elemental Powder each; 50 powder makes an Elemental Capsule, which needs 4×4 free space and can hold Errtels of Radiance, Radiance slot fragments, Elemental Runes and mid-tier pentagrams. Levelling junk becomes the exact materials this system runs on.

Two more rules hold. Pulling an errtel out of a pentagram requiring level 299 or below always works; from level 300+ you need Spirit's Protection for a guaranteed 100%. And pentagram level requirements were cut — the Lorencia Knights' Iron Wall Shield, Hero's Elixir and Gladiator's Dagger from 300 to 150, their magic-imbued versions to 180, Etramu's Scroll from 200 to 150.

Nars and Core Magriffy: a destination demoted to a stop

Nars was the sixth Acheron region and, in 2015, the hardest ground in the game. On a Season 22 server it has one reason to exist for you: excellent Blood Angel gear drops here and nowhere else. Arca War and the Acheron Guardian do not run here. Two field gate pairs cut the walking; the boss sits behind a third.

Read the elemental columns first: these were the strongest elemental monsters in the game, and the three residents are close enough that no spawn is worth preferring over another.

The boss has roughly a hundred times the HP of anything else here. He respawns every 24 hours with a random element — check it before engaging — and has four tricks.

He regenerates every second if you stop hitting him, so a party that cannot sustain damage through the Clone phase never finishes him. He drops 4 items, including pentagrams and three mount muuns.

All three run at 15× their base ability for their first 30 days, so use one the day you get it.

Evomon: the one part that may not exist on your server

Evomon is the third case: a self-contained event servers switch on or off, so check your event list before planning around it.

Field monsters drop Summon Scroll Fragments; twenty-five combine on their own in the event inventory into an Evomon Summon Scroll. Throw it on the ground and a level 1 Evomon spawns, owned by you. Kill it and the chain evolves a step or breaks. Push one past level 30 and every new scroll starts 4 levels above the last, to a ceiling of level 69.

Breaking the restrictions wastes a scroll. No throwing in a safe zone, or inside Chaos Castle, Blood Castle, Devil Square, Illusion Temple, Vulcanus, Doppelganger, Icarus or Kalima. One Evomon per player or party on the field. And there is a time limit: let it expire and the scroll pays nothing.

The two types pay in opposite ways, which is easy to get backwards. A normal Evomon pays when the chain finally fails; a golden Special Evomon pays the whole party on a successful hunt. Rewards go to the Gremory Case, and your ranking entry is the highest level you managed plus one, shown top-left.

The rules underneath your levelling

Experience follows damage

Hunting experience rose across every band — a level 100 character on a Yeti from 275 to 439, a level 300 character on Alquamos from 1,132 to 1,912, a level 500 character on Erohim from 4,811 to 5,736. The rule that came with those figures matters more: your share of a kill is your share of the damage. Deal 60,000 of a 100,000 HP monster and you take 60% of the solo experience while your partner takes 40%.

Party experience is calculated from the highest-level member's solo value and split by level ratio, with a flat bonus for size and a better one for a set party.

Which is why a five-person set party is the standard shape, and a passenger is worth less than an empty slot.

Bulk combination, which saves you an hour

Several recipes run in batches, with materials and cost scaled to quantity and the success rate rolled per item rather than once for the stack.

Where things drop

Part 3 pinned the item table to specific hunting grounds. The lists have been revised since, but the principle is permanent. Season 10's assignments were potions and town portal scrolls to Lorencia, Elbeland, Noria, Devias and Dungeon; spell scrolls and orbs to matching level ranges; excellent pendants and rings to Atlans, Lost Tower 6–7 and Tarkan; one sphere tier each to Karutan, Aida 2, Vulcanus and Kanturu Ruins; level 380 gear to Kanturu Ruins 3 and Kanturu Relics, skill weapons restricted to the Dark Iron Knight; gemstones to the Tower of Refinement alone.

Two side effects still matter. Monsters began dropping the excellent version of whatever they visibly carry, so what a monster holds tells you what it can give you. And the field bosses Ice Queen, Gorgon, Balrog, Death King, Hydra and Zaikan got their own excellent drop tables on a 24 hour respawn with a single spawn each. Elemental items stopped dropping from Ice Queen, Gorgon, Balrog, Hydra, Phoenix of Darkness and Hell Maine, moving to Atlans, Ubaid, Alkmaar, Debenter, Uruk Mountain and Nars. Blood Castle and Devil Square monsters were capped at equipment tiers 1 to 4.

Interface changes you use without noticing

Class-change quests became trackable in the My Quest window (T), with a live journal that turns green on completion. A Play Guide opens from the HELP icon or F1. Buff-type cash shop items extend up to 50 days when you use the same product again instead of overwriting the timer. At Uruk Mountain, approaching Lord Silvester seals six entrances behind you; leave the area empty for 60 seconds and the gates reopen with the boss at full HP.

What later seasons buried

• Blood Angel is no longer the top tier. It is the first mastery set you own at 400.
• Nars is not the endgame map. Its monsters sit at 116 to 120: go for drops and the boss, not experience.
• The master skill values are historical. The window and ranks 7–9 are current; the numbers have been raised since.
• The event schedule is gone. Twenty-two Blood Castle runs and a 21:00 Illusion Temple are 2015's official timetable.
• Elixir no longer exists, so any guide still listing it predates this patch.

Not buried: Ruud, the Gremory Case, the Event Map Plaza, Mastery Boxes, the fifth pentagram slot, skill imprinting, damage-share experience and the Grow Lancer herself.

What to do about Season 10

• Pick your main before you farm events. Ruud never leaves the character that earned it.
• Learn the Plaza first. M, 20,000 zen, or the notification icon.
• Contribute, do not attend. Boxes are graded on what you did, and too little means nothing.
• Stockpile ancient sets before you spend Ruud. Four pieces need four Souls at 80% each, from +11 sets.
• Open the fifth pentagram slot and aim at rank 3, where the control options are.
• Re-check your imprints whenever you change your bar, because the MU Helper casts only what is imprinted.
• Dismantle set junk instead of selling it: fifty powder is a capsule.
• Do not level on Nars. Take the drops, try the boss, leave.

Our server runs Season 22 on the latest server files, opens on 30 October 2026, with high exp, stats capped at 32,700, events and mini-bosses all day and a custom jewel system. All of the plumbing above is live on it. Make an account, then read Season 11 for what happened to the mastery ladder next, or browse the full guide index.