Set item layout:
Temporal Correction Device
wondrous item, rare (requires attunement)
A silver pocket watch whose hands occasionally move backward for a fraction of a second.
Temporal Correction
When you fail an attack roll, ability check, or saving throw, you can use your reaction to activate the device and immediately reroll the d20.You must use the new result.
Once this property has been used, it can't be used again until the next dawn.
Temporal Instability
If the reroll is a natural 1, the correction collapses catastrophically.You become stunned until the end of your next turn as your mind attempts to reconcile multiple contradictory versions of recent events.
The user manual describes this as:
"A statistically insignificant side effect."