Needs are a type of negative status effects that are related to survival Mechanics in Outward.
Thirst
Thirst debuffs are acquired by spending long periods of time without consuming any fluids.
Hunger
Hunger debuffs are acquired by spending long periods of time without consuming any food.
Weather
Weather debuffs are acquired by spending long periods of time in harsh weather conditions without the appropriate items or equipment suited to the temperature.
Rest
Rest debuffs are acquired by spending long periods of time without resting. Note that these can be considered positive effects for magic based characters due to the mana regeneration properties.