
How it works
A socket item comes with empty slots. You do not put a raw seed into them: first you create a seed, then you merge it with a sphere into a Seed Sphere, and only that finished Seed Sphere can be fitted into a slot to add its option to the item.
- Step 1: get an empty socket item. The official guide names the monsters of Raklion as the place to find them.
- Step 2: create a seed at the Seed Master NPC in Elbeland.
- Step 3: combine the seed with a sphere at the same NPC to get a Seed Sphere.
- Step 4: bring the Seed Sphere and the item to the Seed Researcher in Elbeland to mount it.

Making a seed
The seed recipe at the Seed Master uses an Excellent item, a set item, a Jewel of Harmony, a Jewel of Chaos, a Jewel of Creation and 1,000,000 Zen. Your chance depends on the level of the items you put in. On success you get one of six seed types; on failure every jewel is lost and the Excellent or set item drops to a random level between 0 and 2.
| Icon | Seed | Options it can give |
|---|---|---|
![]() | Fire | Attack/Wizardry damage (scaling with level), attack speed, maximum attack/Wizardry damage, attack/Wizardry damage |
![]() | Water | Defense success rate, defense, shield defense, damage reduction, damage reflection |
![]() | Earth | Stamina |
![]() | Wind | Life recovery, maximum Life, maximum Mana, Mana recovery, maximum AG, AG value |
![]() | Lightning | Excellent damage and rate, critical damage and rate, HP and Mana after a monster dies |
![]() | Ice | Skill damage, attack success rate, item durability |
Seed Spheres and mounting
A sphere on its own does nothing and cannot go into a slot. At the Seed Master you combine a seed, a sphere, a Jewel of Chaos, a Jewel of Creation and 1,000,000 Zen. If it works you get a Seed Sphere, and a better sphere gives a stronger option; if it fails, everything you put in is lost.
- Weapons accept only Fire, Ice and Lightning Seed Spheres.
- Defensive gear accepts only Water, Wind and Earth Seed Spheres.

Level 4 Seed Sphere (Tetra)
The level 4 sphere, called Tetra, drops from monsters of level 132 and up. It is combined at the Seed Master and takes on the element of the level 3 Seed Sphere (Tree) you use. If the combination fails, all items are destroyed.
| Material | Amount | Note |
|---|---|---|
| Sphere (Tetra) Lv4 | 1 | Required |
| Seed Sphere (Tree) Lv3 | 1 | Required |
| Jewel of Chaos bundle (10) | 1 | Required |
| Jewel of Creation (10) | 1 | Required |
| Zen | 1,000,000 | Required |
| Tetra Crystal | 1 | Optional, raises the success rate |
Only one Tetra Crystal can be added per attempt. The Greater crystal adds 60% to the success rate, the Standard one 45% and the Minor one 30%.
Bonus socket option
When the mounted spheres follow certain element orders, the item may roll an extra option. It is never guaranteed, and adding or removing spheres later can make it vanish. A few examples from the official table:
| Item | Spheres (order) | Bonus | Chance |
|---|---|---|---|
| Sword, axe, mace, spear, bow, crossbow, scepter | Fire, Lightning, Ice (level 1-4) | Attack power +11 | 30% |
| Same weapons | Fire, Lightning, Ice (all level 4) | Attack power +22 | 10% |
| Staff | Fire, Lightning, Ice (level 1-4) | Attack power/Wizardry +5 | 30% |
| Helm, armor, pants, gloves, boots, shield | Fire, Lightning, Ice (level 1-4) | Defense +24 | 30% |
| Same armor pieces | Lightning, Ice, Fire (all level 4) | Max HP +31 | 10% |
Taking a sphere out
The old dismantle system was replaced by unsocketing. The Seed Researcher removes a mounted Seed Sphere and puts it in your inventory. The cost is one Jewel of Guardian, 5 Jewels of Chaos and 5 Jewels of Harmony. If it fails, only these materials are lost and the sphere stays in the item.
Older content: 400-level socket gear (eX700)
An archived 2013 official page about the eX700 update added 400-level socket weapons and armor for third-class characters. The weapons were not hunted: each was made from a combination note dropped in Raklion plus monster parts such as Ice Walker's Mane or Dark Mammoth's Horn. The socket armor sets dropped from monsters above level 122. These numbers are from that update and may differ in the current game.
| Weapon | Class | Damage | Speed |
|---|---|---|---|
| Sonic Blade | Blade Master | 109-116 | 35 |
| Blast Breaker | Blade Master / Duel Master | 163-216 | 30 |
| Angelic Bow | High Elf | 179-202 | 45 |
| Horn of Steel | Blade Master | 177-206 | 25 |
| Spite Staff | Soul Master / Duel Master | 66% spell power | 25 |
Sources
- MU Online (official): Socket System
- MU Online (official): 4 Level Seed Sphere
- MU Online Wiki (Fandom): Seeds
- MU Online (official, archived 2013): eX700 Plus [Item]
Game pictures: © Webzen Inc. · muonline.webzen.com







