The Realm of Shadows may be the same World of Shadows as the one that becomes visible when a [Elixir of Shadows] is consumed. It may also have something to do with shadow magic and shades. Death knights, necromancers, and undead as a whole share a strong connection with the Realm of Shadows from many hints that can be seen in-game. In the death knight starting zone, death knights are given the task to enter the Realm of Shadows in order to gain their Deathcharger. Later on, death knights are eventually able to learn the ability [Raise Ally] which pulls their ally's spirit back from the Realm of the Dead and forces it back into their body. Upon doing so, a buff is applied to the player stating that: "A touch of the spirit realm still lingers..." This shows that death knights and necromancers both have a connection to the Realm of the Shadows/Dead to perform necromancy which furthers the idea that they actually are drawing their magical power from it.
When the time comes to ally with one of these four, you’ll want to carefully consider the abilities the Covenant will provide you. Each provides two abilities tailored to the theme of the Covenant. The first of these is the Covenant’s signature ability, which is available to all Covenant members regardless of class, race, or specialization. This ability helps you explore and engage with the world in new ways, and gives you a unique tool to help solve the problems you encounter in the Shadowlands. The second of these abilities is specific to your class, and gives you a new spell or power to use in combat.
Windows 10's latest update is almost here, so it's time to go hands-on with the finished product and see what's new. Windows 10 Version 2004, likely known as the April 2020 Update, will begin rolling out this spring with a few notable new features and changes. This certainly isn't a large update, but some of the improvements will be welcomed by many.
During the Burning Legion's third invasion, the Knights of the Ebon Blade traveled to the Shadowlands to acquire the Aggregates of Anguish, five tormented essences of powerful souls - Admiral Proudmoore, Soulbinder Nyami, Grand Empress Shek'zeer, Grand Apothecary Putress and Archmage Arugal. Salanaar required these to conjure the Steeds of the Damned for the order's new Horsemen.
Shadowy Tormentors inhabit this dimension, and emerge from it to torment death knights such as Koltira Deathweaver. The Lich King originally kept them at bay, but after the Knights of the Ebon Blade left his service, the tormentors are now loose upon them. He even appears in the World of the Dead, as he calls it, riding a frost wyrm during  The Power to Destroy.
With every floor, enemies will become stronger but you’ll also become more powerful by using temporary skills called Anima Powers. Levels will also become more complex the higher you climb—the first few floors will have a simple layout, but higher up you’ll be dealing with traps, puzzles, and locked doors that will require keys held by ruthless enemies.
The spell called "spiritual projection" or "astral projection" brings the caster to the Twisting Nether instead of the Shadowlands; and the Twisting Nether is also referred as "realm of ghosts". However, both planes don't appear to be related, as Outland is floating on the Twisting Nether, but the Shadowlands can be reached in Outland in The Burning Crusade.
The origins of the Shadowlands remain uncertain, but they have existed ever since mortal life first arose in the physical universe. They span all worlds, including Azeroth, on which Icecrown serves as an anchor to the Shadowlands. There are those who believe mortal souls are drawn into this dark place when they die, remaining there forever. Others hope their souls will go on to a brighter place rather than languish for eternity within the cold confines of the Shadowlands.