It appears that the 'savedc' calculation snippet doesn't take proficiency into account, or I'm using it incorrectly. Trying to get just the modifier of the saving throw, so i would do {{10-savedc:con}} but here it's returning 12 instead of 14 like i would expect. What am I doing wrong?
Ah, is there a way to calculate this automatically then? Will i need to make separate calculations for proficient vs not?
EDIT: Right now i'm using this for the calculation: Your Radiation Resistance Score is {{4+characterlevel+modifier:con}}, or {{4+characterlevel+modifier:con+proficiency}} if proficient in constitution saves. Any way to just check if the player is proficient?
There isn't exactly that I can think of, but how is this Rad Resistance Score to be used? If it's meant to add a value to your CON saving throw, you could say "add {{4+characterlevel}} to CON saves against radiation." And then you'd have a modifier to do so. Though 4+characterlevel is a ridiculous amount to add to a save so I doubt that's how you mean to use it...
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Helpful rewriter of Japanese->English translation and delver into software codebases (she/e/they)
It appears that the 'savedc' calculation snippet doesn't take proficiency into account, or I'm using it incorrectly.

Trying to get just the modifier of the saving throw, so i would do {{10-savedc:con}} but here it's returning 12 instead of 14 like i would expect. What am I doing wrong?
savedc is for calculating the DC of effects you inflict upon others, like a Monk's stunning strike, not your own saving throw modifier.
Helpful rewriter of Japanese->English translation and delver into software codebases (she/e/they)
Ah, is there a way to calculate this automatically then? Will i need to make separate calculations for proficient vs not?
EDIT:
Right now i'm using this for the calculation:
Your Radiation Resistance Score is {{4+characterlevel+modifier:con}}, or {{4+characterlevel+modifier:con+proficiency}} if proficient in constitution saves.
Any way to just check if the player is proficient?
There isn't exactly that I can think of, but how is this Rad Resistance Score to be used? If it's meant to add a value to your CON saving throw, you could say "add {{4+characterlevel}} to CON saves against radiation." And then you'd have a modifier to do so. Though 4+characterlevel is a ridiculous amount to add to a save so I doubt that's how you mean to use it...
Helpful rewriter of Japanese->English translation and delver into software codebases (she/e/they)
It's used in the 5e Fallout conversion. I'm running a campaign in New Vegas using this conversion at the moment.
http://5efallout.*******.com/5efallout:rules:radiation
EDIT: I think i'm fine with this for now. Thanks for the assist!