Survivor

You are well-versed in surviving in Hostile environments, even thriving where others are sure to perish. You gain the following benefits.

Increase your Constitution or Wisdom score by 1, to a maximum of 20.
You require only half the Food and Water normally required for a creature of your size.
You can withstand extreme temperatures indefinitely and automatically succeed on Saving Throws against Extreme Heat and cold for a number of days equal to your Constitution or Wisdom modifier, whichever is lower. After this time, you must make Saving Throws as normal, until you spend 24 hours in a comfortable temperature.