What creature is the Nightmare King?

What creature is the Nightmare King? Ira Wendagoth (pronounced /ˈaɪrə ˈwɛndəˌɡɒθ/), also called the Nightmare King, is a fey creature who operated in a secret basement of the Moon Tower in the Mirror Towers of the Core Spire of Jrusar, and also collaborated with Oleander and Birdie Calloway to build the Veilscatter Scope just outside Bassuras.

Ira Wendagoth (pronounced /ˈaɪrə ˈwɛndəˌɡɒθ/), also called the Nightmare King, is a fey creature who operated in a secret basement of the Moon Tower in the Mirror Towers of the Core Spire of Jrusar, and also collaborated with Oleander and Birdie Calloway to build the Veilscatter Scope just outside Bassuras.