Noble Shapes

1st-Level Druid, Circle of the Noble Beast Feature

You gain two free wild shape per day and can retain the animal form for a number of hours equal to your wisdom modifier + proficiency + your druid level (rounded up). In order to transform additional times after the second, you must succeed on a DC 10 Constitution saving throw. On a fail, you cannot attempt to do so again until your next short or long rest and each successive wild shape per day increases the DC by 5.