You decide that it would be a shame to leave the room without at least getting a good look at the mirror first, so you approach it.
You notice that you are starting to sweat but ignoring it you press on across the simply gigantic room probably 40 feet long by the looks of it and finally get to the mirror. You touch it's rim and surprisingly it is ice cold even though the rest of the room was probably over 90 degrees.
You move in front of the mirror to get a better look at it and what you see in the reflection almost makes you jump out of your skin.