Augmentation allows you to bestow a different power on to a weapon. Of course, you may have previously bestowed a specail ability by using a Soul Crystal. But this is a simpler method than that.
Not too long ago, the Black Anvil Guild discovered a mysterious ore called the Stone of Life that possesses very similar characteristics to Soul Crystals. Bring me the Stone of Life and a weapon, along with several other necessary items, and I will be able to augment your weapon into a new one.
You should be aware that a Stone of Life is not quite understood as well as a Soul Crystal, so we don't exactly know what kind of power will be bestowed at the end of the Augmentation. The Stone of Life that is used in augmentation is also greatly affected by its owner, so once a weapon is augmented, it can only be used by its owner. If the weapon's grade is beyond your abilities, the augmented effect will not appear.
Oh, one more thing -- you can restore a weapon augmented with a Stone of Life to its original state, but it may be costly. Think carefully about what you'd like to do.
Would you still like to augment your item?
Augment.