Gravity throne hologram

The Gravity Throne Hologram Glitch can be seen in the Halo 2 campaign level Delta Halo. Armed with a Ghost, The Delta Halo Vacation, and much patience, you should be able to reach it at the end of the level. However, no Honor Guard Elites will spawn and attack you, and the hologram Prophet that Cortana translates is gone. The Gravity Throne is still there. The reason is unknown, maybe because he shows as an enemy on the sight he might load like the Honor Guard Elites but like them he didn't spawn. The other hologram near the ruins is the same as this too.

Another method: Perform the Floating Switch method. When you are on top, go near the center. You will be able to see the weird structure below. Jump down and if you land correctly, there will not be any Honor Guards, and the Gravity Throne will be there without Regret.