Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.
Effect: "What was resistance is now immunity." -- Enemies have different body parts that may be resistance to certain bullet types.
After you see a dead Elite with a sword on the ground, you will fall through a fleshy hole. You should be in a large room with a bunch of purple machinery. In the middle is a small purple pedestal with an arrow on it, pointing up. Jump on this, then look up to the left and jump on the rock formation. Look up and left again, then jump to that. Walk across the thin bridge and the skull will be on the ground here.
I look on YouTube and copy what number # of rings order... I look many YouTube and failure.. One problem spider of flood stuck under floor so me and my buddy KSI Makepeace can't kill him.. We restart mission then spider still stuck under floor. How we can kill them?