Source: Exploring Eberron
All denizens of Daanvi either embody the concept of law and order or exist to be bound by it. Most modrons, angels, and devils perform administrative tasks as they serve as cogs in the grand machinery of their plane. Nearly all of Daanvi’s inhabitants follow an unvarying daily cycle, each denizen limited by its jurisdiction. Some authorities can move freely and enforce laws in multiple layers. But a deva can’t take action in the Iron Ward, even if it feels that an adventurer is suffering injustice, because that ward is under the jurisdiction of the local devils.
The angels and devils of Daanvi use normal statistics, but their appearance is similar to modrons and inevitables. They might have metallic skin or wings, or even look like living constructs. These immortals are creatures of absolute law and can’t be compelled to break it or act against their nature. All celestials and fiends of Daanvi possess the following Axiomatic Mind trait:
Axiomatic Mind. The creature can’t be compelled to act in a manner contrary to its nature or instructions.
Daanvi doesn’t have a significant population of mortals, though there are other immortals in Daanvi beyond those explored by this section, each one representing a facet of the plane; for example, ant-like formians inhabit numerous layers of their own
Modrons and Inevitables
Modrons, Daanvi’s most common inhabitants, are embodiments of pure law, with no bias toward justice or oppression. They do their assigned tasks and obey every law; nothing more, nothing less. Monodrones can be found in many layers performing the most basic tasks. More sophisticated modrons perform endless administrative tasks and enforce basic laws.
Inevitables are powerful constructs dedicated to enforcing the law in all its aspects. Mighty maruts can be assigned to enforce specific contracts; note that these maruts have nothing to do with their counterparts in Dolurrh, just as the devils of Daanvi aren’t related to those in Shavarath. The Justify trait of Daanvian maruts transports victims to the Hall of Justice in Daanvi.
In addition to the modrons and inevitables presented in the Monster Manual and Mordenkainen’s Tome of Foes, all of which are found in Daanvi, there are others that serve specific tasks within the plane. In particular, an entity known as the Kolyarut resides beneath the Hall of Justice, with absolute authority over enforcing the law. The Kolyarut acts through a legion of host bodies, one of which serves on every inevitable tribunal; these beings are also called Kolyarut, though they’re only representatives of the greater force.
Angels
The angels of Daanvi represent law in the service of justice and the greater good. These immortals enforce the laws, but also do their best to act fairly and to see that justice is done. While angels have duties to attend to and rarely have time to simply chat with random mortals, they’re typically kind and helpful when they do have time. They believe with all their being that law and civilization are the most vital virtues of all, and that the law can’t be set aside for any reason.
Devas and other angels of similar power are local authorities. They can be found as ministers, magistrates, and sages. A deva may be appointed to serve as a counselor for mortals called before an inevitable tribunal. The devas at the Infinite Archive serve as sages; modrons file and record, but the devas study the data and reflect on it. Meanwhile, powerful planetars serve as high ministers and guardians of important gates and sites.
Solars dwell in the Panopticon. There are thirteen solars, each assigned to monitor and administer justice within one of Eberron’s planes (though no solar holds dominion over the Material Plane). However, there are a host of restrictions on how and when they may act. Typically, a solar must be invoked by a legitimate authority within the plane in question—so while Hazariel, the Solar of Syrania, is usually called in to cast down radiant idols, Azazar, the Solar of Xoriat, has never yet been called on by that plane. Until called, they watch; while in the Panopticon, solars can observe anything that occurs in the plane of their dominion. Shortly before the shift of the Quor Tarai that produced il-Lashtavar, Tyrala, the Solar of Dal Quor, went to investigate the actions that resulted in Dal Quor being thrown off its planar axis; she hasn’t been seen since.
Devils
The devils of Daanvi represent law in the service of tyranny and personal gain. In essence, they depict the danger of laws and how order can become an oppressive force. While the angels and devils of Daanvi despise one another, the strict laws determining jurisdiction mean that they rarely come into contact and almost never engage in combat—though it’s common for a devil and an angel to be found in opposite positions arguing a case before an inevitable tribunal in the Hall of Justice.
Most often, devils are found in layers such as the Iron Ward, where they’re cruel enforcers and tyrants. They can be encountered as guardians and sentinels, though they’re invariably too harsh when it comes to performing their duties. Other devils seek to exploit loopholes and use the law to their advantage, extorting adventurers or otherwise using the law as a weapon. Orthons and erinyes apprehend lawbreakers, while pit fiends serve as executioners in the Hall of Justice.
Formian worker, formian warrior, formian taskmaster, formian myrmarch, formian queen, kolyarut (inevitable), zelekhut (inevitable).
Manual of the Planes: Axiomatic creatures (template).
Monster Manual III: Justicator, visilight
Visilight
In the EBERRON campaign setting, visilights are native to the plane of Daanvi, the Perfect Order.