Jaws of the Lion Exhaustion, Scenarios & Monster Rules Explained

Three systems cause most Jaws of the Lion rules questions: exhaustion, scenario progression and monster turns. They are closely connected because inefficient card use and extra rounds fighting unnecessary enemies are the main ways a party runs out of stamina.

When is a character exhausted?

A character is exhausted if their hit points reach zero or if they can no longer meet the card requirement needed to take a normal turn. Exhausted characters stop participating in the current scenario.

Does losing cards cause exhaustion immediately?

Not by itself. Lost cards reduce the size of your future hand. As the lost pile grows, you eventually reach the point where you cannot form another legal pair of cards, which causes exhaustion.

Can cards prevent damage?

The rules allow a character to lose cards to negate a source of damage. This can prevent being reduced to zero hit points, but the stamina cost can be severe. It is an emergency resource, not free armor.

Short rest vs long rest

Both rest types recover discarded cards while ultimately losing one card from the cycle. The difference is timing and control: a long rest consumes a turn but provides additional benefits and more control, while a short rest keeps tempo but is less flexible.

Do exhausted characters make the scenario fail?

Not automatically. Scenario success depends on the objective and whether the remaining party can still complete it. A scenario fails when its stated failure condition is reached or when the party can no longer complete the objective.

How many scenarios are in Jaws of the Lion?

The box contains a 25-scenario branching campaign. You do not necessarily play every scenario in one campaign because choices and outcomes can open or close paths.

Why are the first five scenarios different?

Scenarios 1–5 form the built-in tutorial. Mechanics are introduced gradually, and the early ability cards contain extra teaching information. Follow that progression rather than applying later-scenario assumptions to the opening tutorial.

Do monsters always move?

No. A monster’s revealed ability card tells you which actions it performs that round. If Move is absent, it does not receive a default Move merely because a target is far away.

Do monsters always attack?

No. The same principle applies: the ability card must grant the relevant action. Focus and movement rules tell a monster how to execute an action it has; they do not create an Attack that is not printed for that round.

Why monster focus matters

Monster focus determines which enemy the monster attempts to reach/attack under the rules. Small positioning changes can therefore alter an entire enemy turn. Resolve focus systematically rather than choosing what “looks sensible.”

Common rules mistakes

• Calling a character exhausted the moment they use a lost card.
• Assuming one exhausted character automatically means scenario failure.
• Letting monsters take default actions not shown on their ability card.
• Skipping the tutorial’s staged rules additions.
• Forgetting that losing a card to prevent damage still accelerates hand exhaustion.

Related guides

For the full round structure, read How to Play Jaws of the Lion. For tactical planning, continue with Jaws of the Lion Strategy. The main overview is Gloomhaven: Jaws of the Lion.