Um Oracle com o mistério Solar poderia realizar isso.
Uma das revelações do mistério é:
Serpent in the Sun (Su)
So long as you are exposed to at least 4 hours of sunlight per day, you no longer need to eat to survive and you gain +2 bonus on saves against diseases.
At 5th level, you become immune to non-magical diseases and no longer need to drink water to survive. At 10th level, you become immune to magical diseases, gain a +2 bonus on saving throws against poisons, and only need to sleep half as long to rest or recover from fatigue or exhaustion.
At 15th level, you become immune to poison and fatigue.
You lose these benefits if you fail to spend at least 4 hours in sunlight in a 24-hour period.
Extraído de link