MU Online Season 4 Guide

Season 4 is an update you inherit rather than visit. Its socket system is still how you put chosen options onto gear today, so the rules below are live knowledge. The rest of it — Laclion and Selupan, twenty level 380 socket items, rank 4 of the master trees, seven class skills and the Summoner's Lagle — has either dissolved into ordinary play or been left behind.

Season 4 in one paragraph

Released across 2008 and 2009, the update had one headline feature and a long tail. The headline was sockets: a crafting chain that let players choose item options instead of praying for a good Excellent roll. The tail was what fed it: Laclion, the only map where socket gear drops, Selupan asleep in its hatchery, rank 4 of the master trees, seven drop-taught class skills, the Summoner's pet and gear line, and a recut event timetable. The Season 3 guide covers the master level system it extended; Season 22 is where the game stands now.

Sockets: the Season 4 system you still run

Sockets are why this season refuses to become history. The system has been widened since, but its shape has not moved: extraction, synthesis, mounting, destruction. Two NPCs in Elbeland cover all four, and every item in the chain trades normally, so you can buy the steps you would rather not farm. Our Season 22 server runs a custom jewel system, worth checking before you commit jewels.

Step 1 — pull a Seed out of old gear

Extraction feeds an Excellent or Set item to the Seed Master and hands back a Seed holding one of its options. Material below +4 is refused and the item's level drives the odds, so a high-plus feeder beats a rare one. A failed attempt knocks that feeder down to a random +0 to +2 and burns every jewel involved.

Which attribute carries which option

Six attributes divide the option pool, and the division decides where a Seed can end up: three weapon-only, three armour-only, no crossover. Read the table before extracting, because a defence option is dead weight if what you wanted to improve is a bow.

Step 2 — fuse the Seed into a Seed Sphere

A Sphere by itself does nothing: no stats, no socketing, just a container. Spheres come from monster drops, Seeds from extraction, and the Seed Master fuses the pair into a Seed Sphere that keeps the option and gains a number. Sphere grade sets how large that number is; only the first grade existed at launch. Failure takes Seed, Sphere and jewels together.

Step 3 — mount it, and mind the order

The Seed Researcher slots a finished sphere into an empty socket for a Jewel of Chaos, a Jewel of Creation and Zen. Weapons accept Fire, Ice and Lightning; armour accepts Water, Wind and Earth. What players get wrong is sequence: three spheres mounted in one specific order can roll an extra option on top, at 30%, while the same three in another order never roll it. Settle the order before the first sphere goes in.

The second layer counts spheres across your whole kit rather than per item, which is the argument for finishing a socket set.

Step 4 — destruction is your undo button

The Seed Researcher also strips a mounted sphere back out, and Zen is the only charge. A wrong option is never permanent, but the sphere does not survive, so read destruction as paying to free a slot.

Laclion and Selupan, met at high exp

Laclion is a frozen map hanging off Devias and the only place socket gear drops, which is the entire reason it was built. Retail gated it at level 270, or 180 for a Magic Gladiator or Dark Lord, with the move command ten levels higher. On a high-exp server those thresholds fall in your first session, so the real gate is survival: all five field monsters here hit for well over a thousand.

The hatchery is the part worth remembering. You can come and go freely while Selupan sleeps; once he is awake and a short grace period passes, the entrance locks and Sherman stops working, so whoever is outside stays outside.

Waking Selupan

Destroying the spider eggs inside the hatchery brings Selupan out, and you get five minutes of free movement before the door shuts on everyone inside. He carries 4,800,000 health, a defence success rate of 1,800, varied heavy attacks and high-grade drops: a raid target in 2008, a short fight for a geared character now. Our server runs mini-bosses all day, so he is one line on a long schedule.

The blanks are the source's: the patch note printed only level, health and defence success rate.

The twenty socket items, and what the tables are for now

Twenty drop-only pieces shipped with the update — eight weapons, four shields, eight armour sets — all restricted to Laclion. Each rolls the ordinary options any item can roll — added attack power, added defence, added magic power, added defence rate, Luck, automatic HP recovery — and each carries one to three sockets decided the instant it drops, bows up to five. No NPC adds a socket afterwards, so socket count is the first thing to read on a drop and the only thing you cannot fix.

Every piece is a level 380 item, which puts the list behind a Season 22 character. Read the tables as identification rather than ambition: what you are holding when something drops, and whether its sockets justify the jewels.

Wear restriction on all eight is level 380; drop level is the monster tier they come from.

Cells read defence / item level. Both Magic Gladiator sets are four-piece, and every piece needs level 380 to wear.

Seven class skills that stopped being milestones

These seven were a reward structure as much as a power bump. None are trained: the orbs, spell books and scrolls that teach them drop from monsters of level 100 and upward, which in 2008 meant farming for a book. On a high-exp server you pass level 220 long before you think about an endgame build, so collect them in passing. Watch the energy lines rather than the level lines: 1,058 energy is a stat-build decision, cheap to revisit with max stats at 32,700.

Lagle and the Demonic line for Summoners

The Summoner got a pet, three skills and a gear line. Lagle was contracted in the other world of Kalun and is written up as the guide of misfortune, with plague and decay following wherever it appears. It earns its keep through one skill: equip the Book of Lagle and Pollution becomes castable, contaminating a wide circle at a point you pick, slowing monsters that walk in and damaging them over time. That is a farming tool first.

Berserker is the one to understand before pressing it, since the trade is not optional while the buff runs. The Demonic gear is starter equipment — item levels 70 to 100 — a stepping stone, not kit she keeps.

Master rank 4 is now the shallow end

Rank 4 opened across all four trees here, and at the time that was the ceiling. Later seasons pushed master level well past this board, so these rows are the first rungs of a longer ladder. Two rules from the update still catch people out: an unlearned skill cannot be enhanced, and a weapon skill can be invested in with no weapon equipped, you just cannot cast it unarmed. Points are scarce, so feed the tree you attack with.

Retail balance patches that never reach your server

The last block was housekeeping aimed at 2008 retail economics, and this is the part that does not apply to you. The timetable was recut from 42 daily openings to 36, Chaos Castle payouts were adjusted, ticket materials moved from monster drops into NPC shops, and Zen income was rebuilt on a different formula. On a private server all of that lives in configuration; ours runs events all day, which makes the table below history.

Experience from event maps below Master Level grade went up at the same time, and the first-place pool shifted: less chance at a Jewel of Creation, more at a Jewel of Life.

Two rows below still matter. Socket items rank below Normal items for upgrading, useful when deciding what to feed into extraction. And set experience stopped being a Dark Knight, Elf and Dark Wizard privilege, covering Magic Gladiator, Dark Lord and Summoner parties too, which is still how parties work.

What to do about Season 4 on a Season 22 server

Short version for a new character:

• Learn the chain before spending jewels: a failed extraction costs the feeder item, a failed fusion costs the lot.
• Decide the mounting order first; the 30% bonus rolls are free value.
• Buy the steps you do not enjoy. Everything in the chain is tradeable.
• Collect the class skills while passing level 220, then stop thinking about them.
• Go to Laclion for Selupan and socket drops, not for its gear tables.
• Ignore the retail balance rows; rates and timetables are your server's settings.

Our Season 22 server runs the latest files: high exp, max stats of 32,700, events and mini-bosses all day, a custom jewel system. It opens on 30 October 2026, so create an account and roll a character.