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Imperfection
Trait - Property
While under the effects of this Property, when rolling a D20, a Result of 20 is replaced with a Result of 1.
When your Result is replaced, its Critical Success is also replaced with Critical Failure, you do not have both at the same time.
Wuntch's Whatever
Imperfection is a VERY potent negative property and is very rarely found natively on Items and abilities for just this reason. If you are considering applying imperfection to a Dice Pool as a result of roleplay or a consequence of some kind, we recommend putting strong consideration into this choice. A roll with Imperfection can never crit, functionally making that roll almost or completely impossible for Characters that aren't specialised in it, and even those who are, now critically fail on a 20. seems pretty sucky from the players point of view. All that to say, Imperfection is a great tool to apply if a roll SHOULD be desperate and near impossible, but if not, there are plenty of other Properties to spice up your rolls.