Druid Circle: Circle of Scavengers

Contrary to what many druids may tell you, the cities and towns that they tend to eschew are also environments, albeit heavily influenced by the people who live there. Animals can easily adapt to living among humans - be it through existing in their homes as pets and companions, or by living on the edges of society and scavenging what they need from the refuse and detritus that the people leave behind.

Recognising that these urban environments, while not "natural," are still environments and that they deserve some sort of representation and stewardship, you have taken up the duty of looking after them and the creatures that call them home. Druids from this Circle are usually people much more familiar with the urban environment than most - street people, sanitation workers, and the like - who nonetheless recognise its usefulness and its own strange beauty.

At 2nd level, your weapon proficiencies change to better suit your home. You are proficient with all simple weapons and improvised weapons.

You also gain proficiency with one language of your choice and one of the following sets of tools: cook's utensils, dice, playing cards, weaver's tools, or woodcarver's tools. You may also exchange your proficiency with the herbalism kit that you gained from entering the class for another tool on the above list or thieves' tools.

Finally, you can communicate with domesticated animals or animals normally found in urban environments as if under the effects of Speak With Animals.

Swarm Shape

Also at 2nd level, your ability to wild shape now encompasses the hordes and clusters of vermin and scavengers that dwell in the cities. You can wild shape into swarms of animals (such as rats, insects, and ravens), as long as you meet all of the other limitations associated with your Wild Shape ability.

When you are in a swarm shape, you are able to perceive through the senses of all members of the swarm at once, but you cannot maintain concentration on a spell in swarm shape due to the focus required.

Finally, when you take a swarm shape, you may make an Intimidation check against any hostile creatures that can see you as part of the wild shape action, as your body literally falls apart into the component animals.

City Friend

At 6th level, your understanding of the cityscapes you call home broadens. It is no longer possible for you to become lost or misdirected in an urban environment. You are always aware of exactly where you are and the locations of important landmarks and buildings relative to your location in any city you have spent at least a day in, and you have advantage on any checks you make to carouse, gather information, or find a particular object or person in such a place.

Additionally, the damage of swarms you wild shape into or summon is considered magical for the purposes of overcoming immunity and resistance to nonmagical attacks and damage.

Urban Survivour

At 10th level your body becomes much more resilient, and your mind craftier to better survive the hazards of your home. You are immune to disease and poison and can Dash, Disengage, or Hide as a bonus action.

You also gain proficiency with another language or tool from the Urban Tools list. In addition, choose one skill or tool you're proficient with; your proficiency bonus is doubled for all checks involving that skill or tool.

Finally, you are able to maintain concentration on a spell while in a swarm shape, and can wild shape into a swarm as a bonus action instead of an action.

The City Aids Its Own

At 14th level, the very environment you protect will come to your aid if you fall. If you are reduced to zero hit points, you can choose to wild shape into a swarm (as per Swarm Shape). Using wild shape in this way doesn't count as a use of that ability. In addition, you cannot be subject to attacks that use a creature's reaction, attacks against you have disadvantage, and you have advantage on saving throws. This form shift lasts one hour and you can end it as an action; when you end the form, you gain one hit point.

When you wild shape this way, eight more swarms of the same type of creature are immediately summoned into the spaces adjacent to you. These swarms act immediately to aggressively protect you from threats and act on your initiative in subsequent rounds. These swarms add your proficiency bonus to their AC, attack rolls, damage, ability checks, and saving throws, and vanish when killed or after 1 minute.

Once you use this ability, you cannot use it again until you finish a long rest.