Skill enchantment includes a common enchantment, safe enchantment, untrain and route alteration.
Enchant a Skill
This is a common skill enchantment. If the enchantment fails, the skill is initialized.
Safe Enchantment
This method is used to enchant skills more safely. Even if the enchantment fails, the skill does not initialize. Using this method requires 3 times the experience and SP as a common skill enchantment, and you must have the Giant's Secret Codex of Mastery.
Untrain
Turns an enchanted skill back to SP. The enchantment level will drop by 1, and 80% of SP will be restored. To use this option, you must have the Oblivion Codex. If you untrain at level 1, your skill will be initialized.
Enchantment Route Alteration
This function changes the route of an enchanted skill. Based on the variable success rate, the enchanted skills will either maintain their level or drop 1-3 levels. Changing the route requires both the same amount of SP needed for gaining a level as well as 20% of experience. You must have the Giant's Secret Codex of Discipline.