Source: Unapproachable East
You can draw strength and sustenance from the land itself.
Benefit: Before resting, you may draw upon, the power of the land to revitalize your body and mind. This allows you to recover 2 hit points per day of light activity, or 4 hit points per level for each day of complete rest, and 2 ability score points per day, or 4 ability score points for each day of complete rest. This stacks with the benefits of long-term care provided by someone with the Heal skill.
You may also use the energy of the land to fuel your body's need for food and water. This gives you a +10 bonus on Constitution checks made to avoid subdual damage from hunger and thirst (see Starvation and Thirst Dangers.
Finally, you may use the power of the land to refresh your mind and body as a supplement to sleep. You require half as much sleep as normal (although you still have to rest a full 8 hours to prepare spells or regain spell slots).
Outside of Rashemen, you must make a Concentration check (DC 10 + 2 per 100 miles from the border of Rashemen) to activate this ability. If you fail, you cannot retry for 1 day.