Paithan's Hot Streak
(Alteration, Enchantment/Charm, Wild Magic)
Reversible

Range:  0
Components:  V, S
Duration:  Special
Casting Time:  5
Area of Effect:  Creature touched
Saving Throw:  Negates

This extremely potent spell gives the target a run of good luck. This run of luck is accomplished by applying the margin by which each die roll is succeeded as a modifier to the next. If the first die roll after the spell is cast is failed, the spell dissipates without effect. However, if this roll is successful, then the margin of success is taken as a modifier for the next roll. The spell will expire at the end of the duration (that is, after 1d6 rounds + 1 round per level), or upon the first failure of a die roll.
Note that this spell only applies to die rolls which have the concept of success versus failure. For example, the spell will apply to to-hit rolls, but will not apply to damage rolls. Other common die rolls to which this spell applies include thieving skill rolls, saving throws, and proficiency checks.
Modifiers on d20 rolls are converted to and from percentile rolls at a rate of 1 per 20 = 5%. For example, if a d20 roll is made by a margin of six, and the next roll is on percentile dice, the modifier would be 30%. Conversely, if a percentile roll is made by 36%, and the next roll is an 1d20, the modifier would be 7 (percentile modifiers are rounded to the closest 5%).
Regardless of the modifiers being applied to the roll, a natural roll of 1 on 1d20 or 01-05 on percentile dice will fail and break the streak. Of course, if low is good on a given roll, these failure numbers will be a natural 20 or 96-00.
When a hot streak ends, there is a chance that there will be a probability backlash. There is a 5% chance per roll affected by hot streak that the subject will automatically fail on the next die roll after hot streak is over.
The reverse of this spell, Paithan's cold streak, causes the victim to have a penalty applied to each roll that is equal to the margin of failure on the previous roll. A successful roll will break the cold streak. The victim is allowed a saving throw versus spell which, if made, negates the spell. However, if the saving throw is failed, the margin of failure is immediately used as the penalty on the next die roll. Like its reverse, a cold streak is broken if a critical roll is made (a 20 on 1d20 or 96-00 on percentile dice). Similarly, when the streak is broken, the probability backlash may cause the next roll to automatically succeed.
A cold streak cannot be ended prematurely by dispel magic. A remove curse has a base 55% chance to remove the spell, modified by plus or minus 5% per difference in the levels of the casters (cf. dispel magic).

