Fatigue and hunger.

(Machine translation warning). Currently, I can go without sleep or food in my playthrough, while traveling vast distances for days at a time. I'd like to see hunger and fatigue mechanics. For example, an energy bar could be added beneath the health and experience bars. Imagine a character can perform X actions depending on their background and stamina. When these actions are exhausted, the character may become tired. In this case, they will receive a "tired" debuff. For example, a penalty to rolls. Fatigue accumulates, increasing the penalty. Eventually, the character will collapse, which can lead to unpleasant consequences. To compensate for fatigue and restore some energy, you can take a short rest twice before a long rest. A long rest is required for a full recovery. If the character doesn't have enough food to take a long rest, they will receive a hunger debuff, which reduces their maximum energy level. This debuff can also stack, causing unconsciousness or even death from starvation.