At work so don't have the books on me. And I may have the phrase wrong. The option you select at 2/3 lvl to differ your character. Subclass maybe?<br/><br/>Edit. And this is why I shouldn't do things without my actual books. :D<br/><br/>It's actually in Xanthar's lost notes to everything else. The second of the Xanthar books.<br/><br/>And druid circles are the subclasses, similar to cleric domains, bard colleges, barbarian totems, etc.<br/><br/>This one in particular is the circle of seasons. The main thing it grants is a shroud of the seasons. Using druid wildshape  (So 2 a rest) can select a creature within 60ft to make a con throw. If they fail then for up to a min with concentration can put them under one of four effects, a slow/cold damage, fatigue/negative damage, heal, or fire damage. And it takes a bonus action each turn to actually do the heal/dmg portions.<br/><br/><br/>Just something that caught my attention while poking at books.