Every long rest you can roll a 1d100 and attempt to roll a number above an 80. If successful you can choose a skill (not ability score) that will always be treated as a dirty 20 until your next long rest. Keep in mind you will only be able to roll once during the long rest, this feat will not be affected by any stat modifying spells, feats, items, or abilities, such as bardic inspiration, Guidance, Enhance ability, etc.
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