Junkomancer

You excel at junkomancy, the art of magically sculpting trash into less-useless trash. You have researched junkomancy extensively and can even cast junk spells beyond the magical traditions of your peers. You become an expert in Crafting. Add one common junk spell of any rank you can cast to your spell list. Whenever you gain another junkomancer feat, add another common junk spell of a rank you can cast to your spell list.

You fabricate potent ammunition from everyday scrap. As part of your daily preparations, you create up to 10 projectiles and 1 commercial battery per character level. When you create the ammunition, choose if the ammunition counts as cold iron or silver for the purposes of applying immunities, weaknesses, and resistances. Any unexpended ammunition you created reverts into useless junk 24 hours later.

You're a wiz at forging armor from junk. During your daily preparations, you can review the formula of one armor upgrade in your formula book of your level or lower. Until your next daily preparations, whenever you cast junk armor, you can Install this Upgrade even if there are no available upgrade slots. If you're a master in Crafting, you gain the armor specialization effect of any junk armor you wear.

The weapons you cobble together are bigger, meaner, and junkier. During your daily preparations, you can review the formula of one weapon upgrade in your formula book of your level or lower. Until your next daily preparations, whenever you cast junk weapon, you can Install this Upgrade even if there are no available upgrade slots. If you're a master in Crafting, you gain access to the critical specialization effects of weapons you create using junk weapon.

You magically assemble a barricade using nearby items, junk and scrap. The barricade occupies a 5-foot square and provides lesser cover for you and one ally, though you can Take Cover to increase this benefit to standard cover. The barricade has Hardness 15 and 54 HP. When destroyed, the junk barricade creates an area of clutter that is difficult terrain.

Ammunition you create from scrap and trash is imbued with more special properties. When you create junk ammo as part of your daily preparations, choose two precious materials from the following list: abysium, adamantine, aucturnite, cold iron, siccatite, or silver. The ammunition created with this feat counts as both materials for the purposes of applying immunities, weaknesses, and resistances.