Isn?t it just as the other Resist Rolls? Mainly Character level vs Effect level? So if the character is level one, and has to resist a level 3 effect, it becomes 65. Same character level but against a lvl5 effect would be 75. Its 50 at its base, then five up/down depending on the difference in level. Its up if the Effect is higher level, and down if the Character is higher level.