I don't know if these are well-explained anywhere in a help file, so I'm laying these out. If this information isn't in any help file, I'll write one.

Carrion Fields has a long-used (*) function which is essentially a fancy check against Constitution (CON). It has three modes, originally to deal with resistances and vulnerabilities: Poison, Disease, and Other. It used to just be a dice roll against CON, tweaked by res/vulns.

"Other" covers matters of endurance, resistance to pain, etc. Battlerager abilities give some perks here, for example.

These aren't traditional saving throws, in the sense that level doesn't matter, there is no gear category for it, there is no data about the "attacker", etc. Over the years, other things have crept in: Edges, Legacies, subclass abilities (swampdweller rangers vs. poison/disease while in a swamp, etc.), etc.

(*): I found a code update from April, 1997.

valguarnera@carrionfields.com