You can augment weapons through the Blacksmith NPC of every village.
For each item to be augmented, a Life Stone and Gemstones are needed, along with the weapon the player wants to augment. Life Stones can be acquired from hunting monsters. There is a higher chance of obtaining a high-level Life Stone from raid/boss monster rather than from an ordinary monster. A Life Stone shows the level of the character who can use it.
For the augmentation order, select the weapon to be augmented, the Life Stones, and Gemstones in the Augment window. Drag and drop the items from the inventory to add them to the Augment window. Click the Augment button.
Blacksmith NPCs can also remove augmentations, and a fee is assessed during the process.