Netherealm appears to be, like Outworld, a realm composed of thousands of different layers. In the Mortal Kombat universe, deceased souls or entities who have committed major crimes descend into the Netherealm to undergo endless torture. In fact, one cannot enter the Netherealm without being evil or have a soul tainted with evil. It is an alternative, more generic name for the Abrahamic concept of Hell, as one of its former rulers was Lucifer (whose name appears only in the Sub-Zero game manual but not in-game). It is also described as "the darkest region of reality", and is inhabited by demons, monsters, and beings of the purest evil.
Though exits from and entrances to the Netherealm are very limited for obvious reasons, the world had quite a tumultuous history. Millions of years ago, the fallen Elder God Shinnok was banished there. After ages of imprisonment, he was able to break free, deposing Lucifer in the process. He restructured the realm to bear some resemblance to Earthrealm, the world which he had long desired to make his own. He later used it as a staging ground for the invasion of Edenia, but found himself cast into the depths of the realm again after this invasion was foiled. The abandoned war machines of Shinnok were then put to good use by one of his former acolytes, Noob Saibot.
In The Machinima, Jack Raiden Has To Take A Direct Route To This Place In Order To Actually Reach The Deadly Alliance HQ, Along With The Soul Outpass As Well.
Shadow Priest X15
Caution! A Powerful Enemy Is Near!! (Secret Enemy):
Grim Reaper (Death) X1
Scoff's Medicine X5
Power Medicine X2
Approval Script X1