You gain proficiency with a type of vehicle, or an expertise die if you are already proficient. You may spend 1 exertion to reroll a **failed ability check** related to vehicular activity, such as [tool checks](https://a5e.tools/rules/maintenance) to repair a vehicle, [[Acrobatics]] checks to keep balance on a moving vehicle, or [[Animal Handling]] checks to calm animals drawing a vehicle. Likewise, if you are piloting a vehicle, you may spend 2 exertion to reroll a **saving throw** made by the vehicle. In both cases, you may choose whether to use the new roll or the original. **Source:** Venture Forth #soldieringKnacks #gainProficiency #vehicleBonus #reroll #maintenance