Obelisk

The dark pylon is a Dark Templar structure similar to a pylon. It was featured in the ESL Finals 2009 event, where it had the ability to increase the speed at which probes harvested resources.

Development
Early versions of the dark pylon cloaked surrounding structures. Its purpose was to hide a protoss player's tech tree and cloak photon cannons until they began firing, but it was removed from the multiplayer game as it wasn't useful enough.

The Dark Templar are set to have more defensive structures.