Higher plane
From WoWWiki
| This article or section contains lore taken from the Warcraft RPG books.
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According the Warcraft RPG, when the term "higher plane" is used, it is in reference to one of the Known Planes, such as the "Emerald Dream", the "Twisting Nether", the "Great Dark Beyond", the "Elemental Plane", or simply another planet out in the Great Dark Beyon. There are scholars who study the concept of planes and wonder if there are more to discover.S&L 128
According to the books, there are no Dungeons & Dragons style planes within the Warcraft universe. The Warcraft universe is both simple and vast. Unlike the standard D&D world, Azeroth has no distinct Astral, Ethereal, Inner, Outer, Positive, or Negative Planes — just a measureless nothing known as the Great Dark Beyond. An infinite number of worlds spin within the multiverse and its impossible to say whether they are scattered across the universe or superimposed upon each other.WRPG 215
Granted its also said that nether drakes are able to shift between the Astral and Physical Planes according to the World of Warcraft lore writers.[1] However, it has been confirmed that the Astral Plane is yet another alternate term for the Twisting Nether.[2]

