Oneiros

Oneiros houses one of the four entrances to the Emerald Dream. Many high-level elite green dragons make their home here. One of the Green Dragons (Emeriss, Lethon, Taerar, Ysondre) may also appear here.

The name for this locale most likely originates from the Greek myth of the Oneiroi, the sons of Hypnos, god of sleep. They were demonic personifications of dreams, and the most powerful of the Oneiroi was Morpheus, god of dreams. Oneiros is also one of the many names that Neil Gaiman's Sandman (Dream) goes by. A fitting name for the realm of Ysera the Dreamer.