A massive tree into which a fortress has been constructed by the various peoples of the Feywild. It is said to pass into the natural world in a remote forest location on rare occasions.
The dead zone spreading across the Banished Crescent is growing nearer to this fortress. It was to be the site of a celebration of the new year, during the time the fortress traditionally passed into the natural world.
The name is apparently classic Tolkien elvish for ‘moontree’. In print I keep thinking it says something about Illithids.