Once per day, after rolling an intelligence based skill check, but before you know the results (weather the check failed/succeeded) you can choose to roll survival with advantage and take the survival roll in place of the the intelligence roll. This cannot be used for arcana checks - only religion, investigation, history, or Nature.
If you ever have a crit success on a nature roll or survival roll (even in the case described above) you gain temporary hit-points equal to your Survival modifier.
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