The Druid

Holding high a gnarled staff wreathed with holly, an elf summons the fury of the storm and calls down explosive bolts of lightning to smite the torch-carrying orcs who threaten her forest.
Crouching out of sight on a high tree branch in the form of a leopard, a human peers out of the jungle at the strange construction of a temple of Evil Elemental Air, keeping a close eye on the cultists’ activities.
Swinging a blade formed of pure fire, a half-elf charges into a mass of skeletal soldiers, sundering the unnatural magic that gives the foul creatures the mocking semblance of life.
Whether calling on the elemental forces of nature or emulating the creatures of the animal world, druids are an embodiment of nature’s resilience, cunning, and fury. They claim no mastery over nature. Instead, they see themselves as extensions of nature’s indomitable will.

In The Nameless Trilogy World

The world has grown, past its rustic villages and feudal castles. Now a single man with a large enough engine can fell an entire forest. War has grown especially dangerous to the wilds, forcing animals to adapt during the Tenfold War when artillery shells leveled whole woods. Cities grow larger, which means more mouths to feed, which means more land used for farming. The wilds which once inspired fear and trepidation are now pushed back into submission. Although some civilizations (the wood elves, the tortles) protect much of their nature, even they recognize the need for advanced cities in this modern era.
How does the druid fit in this new land? Do they protect nature from the cities, or simply work to mitigate the effects of civilization? Are they more concerned with the habitats of animals or with the over-extraction of resources? Or do they willingly choose to live in the city and use their particular brand of nature magic to assist civilization?
The druid strikes many people as an odd class. Most often seen as recluses or strange hermits, the druid has been stereotyped for their lack of participation in the advantages of modern technology. However, you should not take that as a discouragement. The druid is a flexible class even in the modern era. The march of civilization and technology will always continue, but how we treat the world and the wilderness will forever define those who participated in that march. The druid can speak for those who have no voice, for nature which is now being pushed backwards.

Resources:

• Player's Handbook
• Xanathar's Guide to Everything
• Xanathar's Lost Notes to Everything Else
• Sword Coast Adventurer's Guide

Subclasses:

• Circle of the Land (PHB)
• Circle of the Moon (PHB)
• Circle of Dreams (XGtE)
• Circle of the Shepherd (XGtE)
• Circle of Seasons (XLNtEE)
• Circle of the Spiritlords (XLNtEE)
• Circle of Swords (SCAG)