Eberron Druid
Druids draw primal magic from the world itself. The process isn’t like the spells of a wizard or the tools of an artificer, nor is it a divine petition to a higher power. Well, not exactly. Legend recounts how the great progenitor dragon Eberron enveloped the jealous evil of Khyber in the living prison that would become the world. If arcane magic comes from the tears of Siberys above, then Druidic magic is the blood and breath of Eberron herself, granting power to those who seek to defend her and the natural order from the threats beyond.
Most druids are swathed in tradition, usually initiated by a sect that teaches the secrets of this primal magic while also charging the aspirant with specific duties. While some sects are loosely aligned, each one has its own ideas as to the role their kind should play in the world. Morgrave Miscellany, page 25, gives examples of what playing a Druid in Eberron might look like.
In addition to the subclass options presented on dndbeyond, the following Druid Circles are also available:
Circle of The Arbiter
Members of the Circle of the Arbiter understand that the material world is just one aspect of reality. These planar defenders are sworn to protect the natural world from the denizens and influence of the outer planes. The druids of this circle are drawn from many different sects, and in this order an Ashbound stands shoulder to shoulder with a Greensinger as the last bulwark between Eberron and the beyond. This diversity strengthens the circle, as every tradition offers unique advantages and techniques to counter different threats.
- Source: Morgrave Miscellany, page 31
Circle of The Eclipse
Shifters are said to have founded this druid circle, which teaches the same techniques their people must employ to master their racial gifts. They are able to channel the Wild Shape powers of other druids in a more controlled way, partially transforming their bodies without needing to fully assume animal forms. Sometimes known as moonspeakers, they have a mystical reverence for the 12 moons of Eberron. This binds them to the magic of these celestial bodies as they gain power, and such druids bring the radiance of the moons even to places where darkness would mask their light.
- Source: Eberron Archetypes, page 15
Circle of The Path
Druids of the Circle of the Path exclusively belong to the Greensinger druidic sect. While it may be easy for others to dismiss the Greensingers as a bunch of capricious wild-folk that cavort with fey, they have a surprisingly deep connection to nature and the planes. Their close ties with Thelanis, the Faerie Court, have planted the seeds for a new planar philosophy of druidism. While other druidic sects believe that the "natural world" begins and ends with the material plane, some vehemently so, Greensingers of the Circle of the Path maintain that all planes of existence have a place in the natural order—from the Perfect Order of Daanvi to Xoriat, the Realm of Madness. The Circle of the Path is a relatively new philosophy within the Greensinger sect, which is mostly comprised of druids of the circle of the land, moon, or twilight.
Restriction. You must have been initiated into druidism by way of the Greensinger druidic sect.
- Source: Korranberg Chronicle, page 67
Circle of Purity
Circle of Purity druids exclusively belong to the Ashbound druidic sect. They believe that civilization is a corrupting force in the world, and typically smear wood ash on their faces as a symbol of its ravages. Though what counts as "civilization" varies from one member of the sect to another, all are united in believing that arcane magic is the most pressing threat to nature that exists. All arcane works must be destroyed and practitioners of the arcane arts punished. While many influential members of the Ashbound are druids of the Circle of the Land, druids of the Circle of Purity are the best they have at rooting out and countering the threat of unclean magic.
Restriction. You must have been initiated into druidism by way of the Ashbound druidic sect. Furthermore, you must be UNABLE to cast artificer, bard, sorcerer, swordmage, warlock, or wizard spells.
- Source: Korranberg Chronicle, page 64
Circle of Ruin
Circle of Ruin druids exclusively belong to the Children of Winter sect. The "winter" that they take their name from is a metaphor for the cycle of death and decay, rather than the literal season, for when winter comes death blankets the land and only the strongest survive. Children of Winter believe that to live is to struggle against your own weakness, to fight for survival, and that it is the predator's right to kill the prey. While many of their leaders are druids of the Circle of Ruin, they respect Circle of the Moon druids among their kind as well.
Restriction. You must have been initiated into druidism by way of the Children of Winter druidic sect.
- Source: Korranberg Chronicle, page 65
Circle of the Seal
The Circle of the Seal is one of the oldest known druidic circles on Khorvaire, believed to be one of the three circles of druidism taught to the original orc druids by Vvarrak. However, despite its age, the Circle of the Seal is exclusively found among the Gatekeeper druidic sect. Druids of this circle attune with and protect the reality of the material plane as a whole, rather than a single environment like druids of the Circle of the Land. Though not all Gatekeeper druids follow the Circle of the Seal, those that do possess the knowledge and means to safeguard the world against extraplanar threats, and typically lead the sect.
Restriction. You must have been initiated into druidism by way of the Gatekeeper druidic sect.
- Source: Korranberg Chronicle, page 71
Circle of the Wardens
Within the Eldeen Reaches, many guardians work in harmony with the woods. Some of them, like the Gatekeepers, work to stop aberrations and other unnatural creatures from festering and infecting the beloved woods. Others are alien in mindset and hostile towards any intrusion.
Sentinels seeking only to protect the greater woods, the Wardens choose to act as a balance between these schools of thought. Accepting that some beings might need to chop a tree to build a home, or kill an animal for food, they only chase those threats who are simply interested in destruction of the forest without purpose.
- Source: Faithful of Eberron, page 39