Gunsmithing primarily deals with metalworking on a more fine scale, as well as woodworking for inlays, hafts for polearms, and wood for other wooden weapons, as well as fine metals for use in optics and similar upgrades. As such, they work almost exclusively with firearms, polearms, wooden bludgeoning weapons, and trinkets, but may use some leather as accent or connecting pieces.
Gunsmithing Progression
Every Rank in Gunsmithing, the weapons you create gains a to-hit and damage bonus, the armor you create gains an AC bonus, damage and magic reduction bonus, and a number of Lapidary slots to which you can attach Zhotu Cores, some of which are linked to other slots.
| ┌Weapons┐ | ┌─ Armor ─┐ | |||||
|---|---|---|---|---|---|---|
| Rank | Hit | Dmg | AC | DR | MR | Lapidary Slots |
| -1 | -2 | -2 | -2 | -2 | -2 | None |
| 0 | -1 | -1 | -1 | -1 | -1 | 
|
| 1 | -1 | -1 | 0 | 0 | 0 |
|
| 2 | -1 | 0 | 0 | 0 | 0 |
|
| 3 | 0 | 0 | 0 | 0 | 0 |
|
| 4 | 0 | 0 | 0 | 0 | 0 | 
|
| 5 | 0 | 0 | 1 | 0 | 0 |
|
| 6 | 0 | 1 | 1 | 1 | 0 |
|
| 7 | 1 | 1 | 1 | 1 | 1 |
|
| 8 | 1 | 1 | 1 | 1 | 1 |
|
| 9 | 1 | 1 | 2 | 1 | 1 |
|
| 10 | 1 | 2 | 2 | 2 | 1 |
|
| 11 | 2 | 2 | 2 | 2 | 2 |
|
| 12 | 2 | 2 | 2 | 2 | 2 |
|
| 13 | 2 | 2 | 3 | 2 | 2 |
|
| 14 | 2 | 3 | 3 | 3 | 2 |
|
| 15 | 3 | 3 | 3 | 3 | 3 |
|
| 16 | 3 | 3 | 3 | 3 | 3 |
|
| 17 | 3 | 3 | 4 | 3 | 3 |
|
| 18 | 3 | 4 | 4 | 4 | 3 |
|
| 19 | 4 | 4 | 4 | 4 | 4 |
|
| 20 | 4 | 4 | 4 | 4 | 4 |
|
| 21 | 6 | 6 | 6 | 6 | 6 |
|
What a Gunsmith can produce
Ranged Weapons: Blowgun, Derringer, Dart-gun, Pistol, Revolver, Semi-Auto Rifle, Lever-Action Rifle, and Scoped Bolt-Action Rifle
Polearms: Javelin, Spear, Quarterstaff, Trident, Pike, Glaive, Halberd, and Lance
Wooden Smashing Weapons: Club and Greatclub
Other: Metal Trinkets, Wooden Trinkets, or similar things
Weapon and Armor Crafting Checks
Gunsmithing is not a simple process, and takes 8 non-consecutive hours per attempt, the results of which are rolled after the final hour has finished. It is an exhausting process, and attempts to forge more than one item per day result in one level of Exhaustion.
Roll a Gunsmithing Check (1d20 + Dexterity modifier + Intelligence modifiers + Gunsmithing Rank). If there are any helpers, add their Gunsmithing Rank.
This is checked against the DC of the item to be crafted:
DC 14, plus the desired item's rank (if upgrading an item, subtract the item's current rank).
Results
If you roll below the DC, you still successfully create the item, but at a rank lower than what you desired. For every 5 below the DC, the item drops by one rank.
If you roll no more than 4 above the DC, you create your item at the desired rank.
If you roll 5 or more above the DC, you create your item at an elevated rank. For every 5 above the DC, the resultant item increases by one rank, to a maximum of 2 ranks above desired.