See a lot of love for Obsidian Mind and a lot of hate for Skull on these forums, especially for PVP. While OM is my go to exotic for Voildwalker in PVE, I love using Skull in the Crucible. Why? -more super energy from grenade kills (OM's inverse shadow perk is wasted in PVP) -tougher while Nova bombing -Siphon powers increased: if you run the right perk set up, you'll notice a difference to your play style and speed. Sign if you love using the Skull! :) and if so/not, why? Edit: thanks for all the replies everyone, interesting to hear your preferences in Warlock set ups!