Typically used with: Endurance.
In short: tough it out. The Stamina skill is used when a character is performing strenuous activity. Many environmental effects require a Stamina check to shrug off, such as extreme heat, cold, thin air, or no air. Performing strenuous activity for longer than usual will also require one. Survivalists, backpackers, and free-divers would make heavy use of the Stamina skill.
Any time you're trying to push your body past its natural endurance limits, it calls for a Stamina check. Failing a Stamina check usually moves you down the Knockout Track.
When you get hit with a concussive force, you have to make a Stamina check against a variable DL to avoid moving one stage down the Knockout Track. This includes the Knockout tactic in combat (see Chapter 10: Combat), the effects of the Artful Dodger trump (see Chapter 7: Trumps), and proximity to an explosion, like someone hurling a black powder grenade (see Chapter 11: Equipment).
As detailed in Chapter 4: Life and Death, the tiring version of Stamina Drain comes into play whenever you want to perform any physical activity for an extended period of time, for example hiking, running, laboring, climbing, swimming, and staying awake. You have to make recurring Stamina checks as long as you continue the exertion or wakefulness. The DL for each additional check is higher than the last. Each failed Stamina check moves you one stage down the Knockout Track, but you can keep going until you collapse. Once you reach stage 5, you gain the unconscious condition.
For example, marching more than 8 hours will subject you to Stamina Drain (DL 15; +1 every hour; tiring). The challenge is even more difficult if you're trying to jog with all your stuff. In this case, you can only go for 4 hours before you're subject to Stamina Drain (DL 18; +2 every hour; tiring).
The lethal version of Stamina Drain has far more serious consequences. You have to make recurring Stamina checks as long as you're subjected to the following life-threatening conditions: dehydrated, exposed, starving, and suffocating. The DL for each additional check is higher than the last. Each failed Stamina check moves you one stage down the Knockout Track. Once you reach stage 5, you gain the unconscious condition. If you remain subject to the danger and fail another check, you die.
For example, when someone chokes you in combat you gain the suffocating condition and become subject to Stamina Drain (DL 15; +1 every round; lethal).
Clothing, equipment, and gear meant to counter the effects of the environment, like heavy winter cloaks, sunscreen, or airy white linen robes, grant a +4 to the Stamina check.
Certain spells with physically taxing effects can be defended against using a Stamina check, for instance Thunder and Flare. In this case, you may add any points in Magic Defense to this roll. The mage makes a Casting Roll. You make a Stamina check. If your result meets or exceeds the Casting Roll, you elude the effects of the spell.