The Tairnadal have tremendous respect for the power of nature. Many of the greatest heroes of the elves have been rangers, who combine martial skill with a magical bond to the natural world. During the uprising against the giants on Xen'drik, Tairnadal druids countered the magic of the giants with storm and thunder, and they bolstered the ranks of the elf army with the beasts of the wilds. A number of the druids joined the battle in animal form, and the greatest Tairnadal rangers rode into battle astride druids who used wild shape to assume the forms of mighty stallions. In one of the most fearsome battles of the uprising, a giant wizard of the Sul'at League laid a terrible curse on the opposing druids, forever binding them in animal form. The Tairnadal believe that the spirits of these champions of nature live on in their descendants, and they hold that these beings deserve the same respect as the other heroes of history. For a Tairnadal cavalry warrior, a horse is not simply a tool or a weapon: He is a brother striving toward the same destiny. Valenar rangers prize the ability to speak with animals as a way to strengthen their bond with their mounts. The typical Valenar ranger possesses a horse as her animal companion, and she believes that the improved abilities of the horse are a sign of the horse's ancestral guide. Druids capable of casting awaken are rare, but a few of the great champions of the modern age ride awakened steeds.

The druids of the Valenar serve two roles. First and foremost, they are charged to preserve the bloodline of the elven horses. The druids protect the breeding grounds, tend to injured horses, and help raise the young. These blood guardians mingle with the herd using wild shape and speak with animals, forging the bond between horse and elf from the earliest days. They also help to match elf and rider, working to forge the bond between rider and mount. Beyond this, the Siyal Marrain are warriors. Just as their ancestors fought the giants with lightning and flame, the druids of the modern day may ride with a warband, turning the power of nature against their enemies.

Source: Dragonshard - Druids of Eberron: The Horse Watchers

Politics of Valenar

The druids of the Siyal Marrain, like the Keepers of the Past, straddle the line between zaelantar and zaeltairn. The Siyal Marrain are not the kind of druid that seeks to preserve some supernatural concept of natural balance – they exist to serve the Tairnadal people. Zaelantar members cultivate the land and tend to herds of animals, while Zaeltairn help sustain the clan and bring primal wrath to bear against the clan’s foes.

Valenar Animals

The people of Khorvaire have heard fantastic rumors about the “Valenar Animals” brought with the elven warclans – horses faster than even the finest magebred warhorses of Vadalis, hawks capable of relaying troop movements down to the individual soldier, hunting dogs that can sniff out lies. These rumors are true – the animals of the Tairnadal possess supernatural capabilities.

During their war with the giants, the elven druids known as the Gyrderi were key allies in the elven liberation effort. The warlocks of the Sul’at League devised a countermeasure – a curse to trap the druids in their animal forms. The Gyrderi remained loyal allies, but over generations of war the animals lost their intelligence and magic. The Siyal Marrain were a new order of druids formed to shepherd the bestial descendants of the Gyrderi druids, cultivating these spirits like how the Keepers of the Past cultivate the spirits of the Tairnadal as a whole.

The Host of Valenar has established a few heavily guarded ranches for raising more horses. While the agreement with House Lyrandar keeps the flow of troops across the Aerenal Channel, the elves have recognized the strategic value of keeping a fresh supply of horses more available if the sea lane were to ever be cut off.

House Vadalis has earned the eternal enmity of the Host of Valenar for their attempts to steal the secrets of the elven animals. The house, through expensive trial and error, has learned that replicating the elven secret is difficult. To start, all animals deployed into combat are gelded, denying their use in breeding even if captured. Furthermore, specimens still capable of reproducing fail to replicate their unique magic in captivity if not properly raised. House Vadalis would be willing to pay a high price to learn how to replicate this process, and some of the more unethical members would use any means necessary in the pursuit of these secrets. 

All characters that are members of this organisation.