Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Mission: Crow's Nest
Effect: "Bash your way to better health." -- Your shield will not auto-recharge anymore, you have to kill an enemy with a melee attack.
From the start without moving anything you can see a massive pipe above you. Walk up the stairs then up the next set, turn to your left and jump up on the shelf unit. From there jump to the red cross beam then up onto the pipe, from there just walk to the end and walk over the Black Eye skull to claim it. You don't have to pick this one up it does it automatically.