The warren wreath is an item exclusive to Don’t starve together Introduced in the depths of duplicity update.
It can be crafted for three grass and a rabbit in the Trading hutch filter by trading with the Benevolent Rabbit King
It’s effects are similar to a garland giving sanity . However it can be refreshed by feeding it most food items (similar to any creatures you can keep in the inventory EG rabbits.) Feeding it will set its hunger to max, making it easy to maintain by simply feeding it petals. If the players sanity is low, the rabbit will turn into an evil rabbit the reducing sanity.