Permanency Ordinance

14th-Level Druid, Circle of the Noble Beast Feature

You have mastered your noble wild shaping. You can stay wild shaped for an unlimited amount of time and the DC for additional shapes decreases to 10. However, you still need to eat, drink, and sleep in your animal's form. You must abide by that creature's food preference (ex. carnivore, herbivore, or omnivore).
When you become an archdruid at 20th level, you do not gain unlimited shaping but your DC for additional shapes decreases to 5.