Though you shoulder the burden of failure, you promise yourself it won't happen again.

Encounter   ✦     Martial
No Action      Personal

Trigger: You miss with an attack roll or fail a skill check or a saving throw.

Effect: Before the end of your next turn, you can reroll a single attack roll, skill check, or saving throw, but not the triggering one. You must use the new result.

Published in Into the Unknown: The Dungeon Survival Handbook, page(s) 31.