S-Grade Armor and Weapons
There is an upgrade system that turns grade A weapons, armor and jewels into grade S ones. The NPC is Ferris, the Aden Blacksmith: talk to him and pick the Learn about upgrade of items option.

Then you go into Upgrade Common Items (S/S80-grade).

The Equipment Upgrade window opens with the items you can upgrade. Each one has its own Upgrade button.

There you see everything before confirming: the materials it asks for, the success chance and what you are left with on a failure. The Qty column shows how much of each material you have, so one glance tells you whether it is enough: what you are missing shows up in red.

When the target item has both a single and a dual version, you pick which one with the two buttons below the result. The dual version asks for one more weapon among the materials — in the screenshot that is the Dark Legion’s Edge, shown in red because it is missing.

The upgrade is irreversible: once confirmed there is no going back.
The Varnishes
Section titled “The Varnishes”Each type of upgrade asks for its own Varnish, and they cannot be swapped around.

External to this wiki.
New bonuses on the S sets
Section titled “New bonuses on the S sets”

