The Wonderland Online team (http://wl.igg.com/ ) is unveiling the mysteries of Strong Scrolls and guiding you through enhancements to make your weapons and armor more powerful.
A Strong Scroll can only purchased from the Mall. Weapons and Armor from the Mall can't be improved by setting Diamonds or Bomb Diamonds in them, or by compounding. The only way to increase their attributes is through enhancement using a Strong Scroll. The level you wish to enhance the item to will determine how many Strong Scrolls you need.
a) 　　+1 = One Strong Scroll
b) 　　+2 = Two Strong Scrolls
c) 　　+3 = Three Strong Scrolls
d) 　　+4 = Four Strong Scrolls
Therefore, if a weapon is enhanced to +4, you will need 10 Strong Scrolls (1+2+3+4=10) If armor is enhanced to +3, you will need 6 Strong Scrolls (1+2+3=6).

These are some examples of the attribute increases for weapons and armor after enhancement:
Weapon:
Sky Sword +4 = atk+18, spd+18, 34% chance of critical strike
Attack Pestle +4 = atk+40, consume enemy’s 95% sp
Crescent Bow+4 = atk+18, spd+18, 34% chance of critical strike

Armor:
Energy Halo+3 = maxhp+140, maxsp+140
Gold Ears+3 = spd+40
Stand Ears+3 = def+40
Dark Evil Wings+3 = atk+24, matk+24

For more detailed info visit the official website: http://wl.igg.com/news/newscontent.php?aid=552