Dolmen

The Dolmen was the name given to an obelisk-like artifact that was made by the Lanteans on the planet known as Halcyon] in the [[Pegasus galaxy]. It was created as a form of defensive measure against the Wraith.

The device possessed a single ZPM that powered a powerful interference signal that interfered with the higher brain functions of the Wraith and degenerated them into savage beasts. Higher caste Wraith were capable of retaining some of their intelligence despite the devices interference signal. Wraith were noted to feel pain the closer they cam to the Dolmen.

The Dolmen was destroyed by Colonel John Sheppard's Puddle Jumper after being threatened by the Wraith known as Scar who held Teyla as a hostage. As a result of this, all the Wraith on Halcyon regained their intelligence and went wild.

(ATL: "Halcyon")