Engraving adds powerful words to your equipment that increase attributes such as Internal/External Attack and Internal/External Defense.
NPC - Ying Zhu:
Guiding Quest in Heavenly Dragon Castle
You can Engrave you equipment at the Engraver.
Engraving is used to increase a Weapon's damage or Martial soul.
Caving can also be used to increase Armour's defense.
You cannot engrave decorations.
The higher the engraving material's quality is, the higher the attributes increased for each engraving will be.
NPC - Engraver:
(^_^) April 20, 2012