Blind Skull
From Halopedia, the Halo wiki
The Blind Skull is one of the skulls found in Halo 2. It is found on Outskirts (Level), and causes the Master Chief to completely disappear. Unfortunately, it also causes his Heads Up Display to disappear, hence the name, "Blind Skull".
This skull stays in effect on all campaign levels until the Xbox is turned off.
