The neutral elder, Hekate, created a huge, breathtaking shadowrealm from her own imagination. This inclued the huge world tree, also known as The Yggdrasill. Many people admired this magnificent shadowrealm. This Shadow realm is accessible from the Human or Humani world. Like most shadow realms, any electronic devices will be drained. Lots of creatures inhabit this shadow realm, including the Torc Allta. A battle was fought in this shadow realm, dark elders and their minions vs. the shadow realms inhabitants and Nicholas Flamel. This led to the shadow realm's destruction.
Dr. John Dee plunged Excalibur into the Yggsdrasill destroying the shadow realm, Hekate, and nearby shadow realms. This released Nidhogg from its prison below the roots. Many elders want revenge on Dr. John Dee. Yet, Josh, Sophie and Nicholas escaped with Sophie being awakened.