Comments from the Finger: When I ask people what type of archetype they'd like to see, a bizarre number of people have commented that they want a druid that can chiefly control plants. The Pinkey has asked for it, the Thumb has thought about it, and two casual people I've DM'd for (who have literally played two sessions) arrived at the same idea. It was only a month or so ago when my brother got me to read the New 52 Swamp Thing that I got on board.
Circle of the Green
Knights of the Green are called upon by the Parliament of Trees to bring balance to the primary forces of life in the world: The Green and The Red. All that is Green represents the slow moving, but utterly ruthless life of plants and vegetation. The Red represents animal creatures of all kind. It is the purpose of the chosen druids of the Circle of the Green to battle the Red and bring restraint to the Green, so that life everywhere may continue.
Beginning when you select this circle at 2nd level, your mystical connection to the land infuses you with the ability to cast certain spells. At 3rd, 5th, 7th, and 9th level you gain access to circle spells connected with the Green.
Once you gain access to a circle spell, you always have it prepared, and it doesn’t count against the number of spells you can prepare each day.
Druid Level Spells
3rd: entangle, goodberry
5th: protection from poison, spike growth
7th: plant growth, speak with plants
9th: grasping vine
At 2nd level, your body is has been enveloped by a thick mass of leaves and vines, an embodiment of the Green, that moves with you as a second skin. Your Armor Class while unarmored is equal to 10 + your Dexterity modifier + your Wisdom modifier. Additionally, you have advantage on Dexterity (Stealth) checks made to hide among vegetation of any sort.
Starting at 6th level, you know any language necessary to communicate with plant creatures, and have advantage on Persuasion checks with them.
At 10th level, when you cast a spell granted to you by your Circle Spells, you may cast it as a bonus action. After using this ability, you must complete a short or long rest before using it again.
Beginning at 14th level, you can Wild Shape into a treant for 1 minute. After using this ability, you must complete a long rest before using it again.
Changelog: 9/18/15: Guardian Form is now rest powered and uses Wild Shape, rather than polymorph rules.