The Spire of Karabor is likely a piece of the temple itself (or perhaps the Altar within), fueled by years of Draenei faith and prayer. Pretty cool. How to Get It: ...

Once called the Temple of Karabor, a sacred site to the Draenei, the temple fell to the might of Gul'dan's Horde, who proceeded to transform it into a headquarters for the Shadow Council.

Their city is Karabor, which was known as the Black Temple in Burning Crusade. It's a temple owned by the draenei in this timeline rather than Illidan's fortress.