There are many tales about the Shadow Lands, though how much truth they hold is unclear. The Dothraki believe that ghost grass covers the Shadow Lands, with stalks that glow in the dark and grow taller than a man on horseback. Daenerys heard that "spellsingers, warlocks, and aeromancers practiced their arts openly in Asshai, while shadowbinders and bloodmages worked terrible sorceries in the black of night". There are also Westerosi maesters in Asshai. The mages of Asshai teach others their healing powers, but also their spells requiring blood sacrifice. Ancient books of Asshai record the Azor Ahai prophecy followed by members of the R'hllor faith. Daenerys heard that dragons themselves originated from the Shadow Lands beyond Asshai and the islands of the Jade Sea, and they possibly still live there. Bran dreams of flying Dragons in Asshai. The petrified dragon eggs Illyrio gives to Daenerys are said to come from the Shadow Lands. The "dour and frightening" Shadow Men cover their bodies in tattoos and wear lacquered wooden masks, and the appearance of the Asshai'i is described as dark and solemn. The Dothraki believe the Asshai'i to be the spawn of shadows. The Asshai'i have a language of their own.