jonathonhawke
Explorer
I might have one or two of those in storage somewhere. I'm 53.
I assume this applies to stuff like Immunity 10 all cold effects. If you had check required on it and the DC was 10 and you roll a 20, you are immune to all cold effects. If you roll a 19, you are not immune to all cold effects."If the check succeeds, the character gains the use of 1 effect rank per point the check exceeds the DC. Thus a check result of 14 allows the character to use up to 4 ranks of the effect. If a lesser rank of the effect doesn’t do anything, then it’s the same as failing the check"

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.