The Chamber of the Eye is the section the Tomb of Sargeras where the Eye of Sargeras was held. It was sought by Gul'dan and later Illidan Stormrage. When Maiev Shadowsong entered the Chamber, Illidan let the Chamber collapse. Naisha and the rest of the Watchers were presumably crushed.
In Legion EditThis section concerns content exclusive to Legion. This section concerns content that is not yet released.
In the RPG EditThis section concerns content exclusive to the Warcraft RPG, and thus unlikely to be canon.
The Chamber of the Eye is the section of Sargeras' tomb that held the avatar of Sargeras and the last remnant of his withered form: the Eye of Sargeras. Demons are particularly prevalent inside the chamber.