Underachiever

Your subpar performance on D20 tests will now sometimes earn you partial credit.

Basically Dodged it. When you are subjected to an effect that allows you to make a saving throw to take only half damage, if you fail the save by your proficiency bonus or less, you can instead take 3/4 of the damage.

Totally Intentional Feint. When you miss an attack roll by your proficiency bonus or less, you can deal half the damage the attack would have dealt to the target creature. This does not count as a successful attack for non-damaging features. 

Shaking the Rust Off. When you make a skill check you can choose to replace your roll with 1 + your Proficiency bonus.