After the third class change the skills themselves can be improved: more power, a shorter reuse, a lower cost or a better chance. This page explains who may enchant skills, what it costs, which book is needed and how to lose as little as possible when an attempt fails.
Requirements
- The third class change is done: see Third class transfer quest: the sagas of every class.
- The character is level 76 or higher.
- The skill is learned to its last ordinary level.
How it is done
Skills are enchanted by the master who teaches your class. Every attempt costs SP and experience, and the first step, from +0 to +1, also takes one 
Secret Book of Giants. A skill offers two or three routes, such as power, chance or cost, and only one of them can be followed. The highest level is +30.
A failed attempt throws the skill back to its ordinary level: every enchant level gained before is lost together with the SP and experience spent, and a new book is needed to start again.
What to keep in mind
- The chance falls with every level gained, so the last steps are the expensive ones.
- The chance depends on the level of the character: the same step is easier at a higher level.
- One skill follows one route. Decide between power and the other options before the first book is spent.