Modifiers
Reusable, actor-driven expressions — @abilities.med.mod, @prof, 2 — resolved against the acting character.
One library serves every activity. A crafting, salvage or gathering check adds the modifiers it selects to its roll; a gathering drop row or event shifts the drop chance by them; a gathering task’s stamina cost is adjusted by them. Each consumer chooses which entries apply and how they combine, but they all choose from this one list.
See /fabricate/checks/crafting.html for how checks select and combine them, and /fabricate/expressions.html for the full expression syntax and the difference between a library modifier and a reference that attaches it.
