Player Core Chapter 6: Equipment Improving Equipment

Grades of Equipment

Equipment typically comes in seven grades: commercial, tactical, advanced, superior, elite, ultimate, and paragon. While most armor, shields, and weapons can exist in any grade from commercial to paragon, some equipment doesn't exist at certain grades and must be initially purchased or crafted at a higher grade. Equipment other than armor, weapons, and shields only exist at grades specifically listed in the item and cannot be improved to a higher grade if it's not listed.

Armor, shields, and weapons (pages 244, 250, and 253 respectively) are typically listed using their lowest available grade, usually commercial. Each grade beyond the first provides the equipment with additional statistics as given in the tables listed for the appropriate item. Equipment listed with multiple grades in their entry do not use these charts and instead use the statistics listed for each grade in their description.

Armor, shields and weapons gain more upgrade slots as they improve. Higher grades of armor add more AC and gains the resilient trait, improving the saving throws of their wielder by the listed value. Higher grades of weapons have improved damage dice and gain the tracking trait, improving their attack rolls by the listed value. Higher grades of shields have increased Hardness, Hit Points, and BT.

While you may attempt to improve an item directly from commercial to paragon in 1 day, doing so makes the DC of the Crafting attempt significantly higher and thus results in a higher likelihood of failure. It also makes it more difficult to craft using fewer materials when you have a formula than if you attempt to Craft the item one grade at a time. When upgrading multiple grades at once, you can only apply a cost reduction based on the cost to get to the next lowest grade.
For example, if Chk Chk wanted to improve his commercial painglaive into a tactical painglaive the DC would be 16 and it would cost 350 UPBs to complete in 1 day. If he uses a formula, he can spend one or more days crafting to reduce the UPB cost using the Craft activity, up to half (175 UPBs) as normal. Chk Chk could improve his commercial painglaive into an advanced painglaive in one day with a DC 19 Crafting check and 650 UPB, but he would still be limited to reducing the cost by 175 UPBs.
At any time, Chk Chk can stop upgrading his weapon and use it at whatever grade he achieved in the Crafting process, keeping track of whatever UPBs he's invested up to that point for future Crafting attempts even if the weapon gets damaged during the interruption.