Halo 2 > Halo 3 > Halo 3 ODST > Halo Reach > Halo CE
Based on campaigns.
So I was bored last night and decided to recover my lost progress in CE on my PC, which sadly ment playing through the Library, Two Betrayals, Keyes, and the worst mission, the Maw
But anyway, while playing through The Maw, I took a wrong turn and ended up in a room with a grill/vent thing on the floor, and when I walk over it, it rapidly depleted my shields. There was also a bright light underneath it.
Has this been discovered before or am I the first to find it?