Days between contracting an affliction and its onset, from the Contagion Test
result and a roll of the affliction's onsetFormula.
A critical failure means the affliction takes hold twice as fast: half the
rolled duration, rounded down. A marginal failure uses the rolled
duration as-is. 0 days means onset is immediate.
Parameters
successLevel: number
The normalized success level of the Contagion Test.
rolledDays: number
The rolled onsetFormula result, in days.
Returns number|undefined
Days until onset, or undefined when the affliction was avoided.
Days between contracting an affliction and its onset, from the Contagion Test result and a roll of the affliction's
onsetFormula.A critical failure means the affliction takes hold twice as fast: half the rolled duration, rounded down. A marginal failure uses the rolled duration as-is.
0days means onset is immediate.