Spirit Stones
Spirit Stones can be inserted into the slots of weapons and armours. They can improve the weapon or armour, and if adding the stone to the weapon/armour fails, it turns into a Piece of Broken Stone
The Piece of Broken Stone can be removed by reinforcing the item or by using the Stone Handbook 
+0, +1, +2, +3 stones are also needed to refine ores at an .png&w=64&q=75){kind=small}
Alchemist (Guilds)
Example: To create 
Ebony you need:
3,000 Yang
x100 Ebony Ore
and a +0, +1, +2, +3 stone. When refining, the stone used is destroyed whether the refining succeeds or fails.
Where can you get stones?
By destroying Metin Stones you have a chance to get a stone as a drop.
In the Grotto of Exile there is a Mighty Ice Witch that drops these stones directly at +4.
Good to know!
4 stones can be inserted!
5 stones can be inserted!
Spirit Stones for Armour
| Image | Item | Information | +0 | +1 | +2 | +3 | +4 |
|---|---|---|---|---|---|---|---|
 | Stone of Haste | Increases movement speed | 5% | 10% | 15% | 20% | 30% |
 | Stone of Vitality | Increases Max. HP | +250 | +500 | +750 | +1000 | +2000 |
 | Stone of Evasion | Chance to block a close-combat attack | 1% | 2% | 3% | 5% | 8% |
 | Stone of Magic | Increases magic resistance | 1% | 2% | 3% | 5% | 8% |
 | Stone of Defence | Increases defence | +2 | +4 | +6 | +10 | +15 |
 | Stone of Ducking | Chance to avoid arrow attacks | 1% | 2% | 3% | 5% | 8% |
Spirit Stones for Weapons
| Image | Item | Information | +0 | +1 | +2 | +3 | +4 |
|---|---|---|---|---|---|---|---|
 | Stone against Warriors | Strong against Warriors | +5% | +8% | +12% | +17% | +25% |
 | Stone of Monsters | Strong against Monsters | +1% | +2% | +3% | +5% | +8% |
 | Stone of Cooldown | Increases casting speed | +5% | +8% | +12% | +17% | +25% |
 | Stone against Ninjas | Strong against Ninjas | +5% | +8% | +12% | +17% | +25% |
 | Stone of Deathblow | Chance of critical hit | +1% | +2% | +3% | +5% | +8% |
 | Stone against Shamans | Strong against Shamans | +5% | +8% | +12% | +17% | +25% |
 | Stone of Penetration | Chance for piercing hits | +1% | +2% | +3% | +5% | +8% |
 | Stone against Lycans | Strong against Lycans | +5% | +8% | +12% | +17% | +25% |
 | Stone against Suras | Strong against Suras | +5% | +8% | +12% | +17% | +25% |