Sanctuary
From Halopedia, the Halo wiki
Summary
One of the newer maps for Halo 2, Sanctuary is a multiplayer level. It is an old relic of a building, and no one knows what it was used for. Some think of it as an important ruin, and some think it is an old church.
Getting Atop
To get on top of Sanctuary, have 3 people go by the pointed rock by a tunnel leading to a Spectre. It is next to a base. Have someone keep jumping on the rock, and as he is in the air, Sword Cancel him. The only part that is not consealed by an invisible wall is the corner. To get in, however, you must crouch and walk forward. It will take a few tries, but then have the 2nd and 3rd persons repeat this. Once 2 are up there, have one stand on the ledge next to the hole you got it and keep jumping. The 2nd person sword cancels and gets atop the level. Have the second guy sword cancel you, and you are both ontop. Keep walking until you reach a pointy Forerunner structure ontop of a base. Have soemone jump, sword cancel them, let them sword cancel you, and then you're over it. Once there, you will notice you cannot go past a spot because of an invisible wall. But, all is not lost! Go as far as you can left, to the barrier, and you can walk through. It was actually a wall of a temple, invisible from that side! You can get atop that, get ontop of the tree, or climb the large hill, (all 4 flights) and then rest on the waterfall, perfect sniping spot, if you have many people, and you can get two people up unnoticed.
