The Brotherhood of Shadow are a cult based around Quan Chi and worship the fallen Elder GodShinnok, scheming and planning for his release from the Netherealm. Its trademarks are stealth, secrecy, deception, and involvement with black magic and necromancy. They achieved their goal when Quan Chi was able to get hold of the sacred amulet needed to free Shinnok from his prison, from where he already controlled the entire Netherealm. Agents such as Noob Saibot and Reiko rose to prominence during the subsequent war with Edenia, the Earthrealm warriors, and Raiden during the events of Mortal Kombat 4.
Their joint effort ultimately failed and Shinnok was defeated. In the events leading up to Mortal Kombat: Deadly Alliance and Deception, Noob Saibot began eluding Quan Chi's control and prepared for the creation of his own armies, while Sareena and Ashrah left the Brotherhood. With Shinnok eliminated as a presence to reckon with and Quan Chi's own plans with the Deadly Alliance, the Brotherhood seems to have lost its importance or is on hold. It appears that for most (former) members, their time spent with the Brotherhood was merely a catalyst for more important things to come. It was later revealed in Mortal Kombat Armageddon that Sareena is again working with The Brotherhood of Shadow. This story is also revealed through her newly released bio. Noob Saibot also led the brotherhood of shadow to the Lin Kuei palace to overthrow his brother Sub-Zero as well as convert his ninjas into cyborg demons.