This article is a stub and does not have enough relevant information. You can help by expanding it.

The Assassin Skull[citation needed] or the Unknown Skull, is a hidden Skull in the Halo 3 level Cortana.[1][2]


The skull can be found in the reactor room, the large circular room just prior to rescuing Cortana herself, on top of the overhang that follows the perimeter of the room.

Note: The skull cannot be located in the Halo: The Master Chief Collection version of the level as it rolls off the canopy into the void below. It can only be found in the original Xbox 360 release of Halo 3.[3][4]

This section requires expansion.


If it is carried for the remainder of the level, it will give the player a Spartan Laser in the next level, Halo.[4]


  1. Youtube - Halo 3 - Skulls Guide - Part 13 - ?/ Unknown / Blind II Skull
  2. Youtube - Halo 3 - Unknown Skull
  3. Youtube - Halo 3 - Secret Skull on Cortana (Revisited)
  4. 4.0 4.1 Youtube - Halo 3 - Is the Secret Skull On Cortana Really A 2nd Blind Skull