Kōmori

The kōmori were shapeshifting bat spirits native to the Islands of Spice and Silk that occasionally took human form. Enemies of the Empire, p. 249 They were also common in the Twilight Mountains of western Rokugan. While they came from the domain of Senkyō, they were associated with Yumedō, the Realm of Dreams, and it was thought they had the power to traverse that ever-shifting realm. Writ of the Wilds, p. 21 The race developed their own language. These yōkai helped Kaimetsu-Uo first survive on the islands. Heart of the Mountain, by Keith Ryan Kappel
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