This article contains spoilers for Legion of X #3.
Marvel Comics has finally explained the astral plane, the strangest dimension in the multiverse and a regular feature in X-Men comics. The astral plane is one of the strangest dimensions in Marvel Comics lore. Introduced back in 1963's Uncanny X-Men #4 from Stan Lee and Jack Kirby, it's a realm of pure thought accessible only to telepaths (and, on one continuity-breaking early occasion, visited by Magneto using forgotten psychic powers). Through the astral plane, psychics can locate any individual mind and even enter into it.
Unfortunately, over the decades the astral plane has become extremely complex. It's often presented as a dangerous realm, inhabited by malevolent psychic entities such as the Shadow King. Some telepaths — including Professor X himself — have escaped death because their minds were banished to the astral plane. There have been occasions where technology has allowed physical bodies to enter the astral plane. Because the pseudoscience is unclear, writers have portrayed this psychic dimension in vastly different ways.
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Legion of X #3, by Si Spurrier and Jan Bazaldua, finally begins to iron out the wrinkles. Spurrier has always been a master of continuity, and the data-pages incorporated into modern X-Men comics give him the opportunity to begin revealing the true nature of the astral plane. One notes:
«The Empyrean. A relativistic substrate of Dimension-616. The abstractions of sentient minds are here represented as loci of informational potential within the infinite psychic matric. [Physical matter cannot endure long without defensive mental technologies.]
NOTE: It is a point of
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