-Secret Glyph Project's (gruntspajamas.com) de facto Ambassador (SGP=GP)
-Likes Secrets and stuff
-Awesome guy
-Is pissed because his nick's first letter is not capitalized
Pedestal = Plinths, as we call them in SGP. This FAQ contains about all the info we have gathered about them.
Quoting the mentioned FAQ:
Plinths are human-sized structures resembling a Forerunner design style and, because of that, are subjects of primary importance to the members of the SGP.
Plinths are somewhat beige/light grey, light and easily movable by a player or physics impulses (such as the blast of a grenade, a melee attack from a Brute, etc.)
They don't really have much to do with the henge, though the first Plinth found was found near it.