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!
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I use OM for PvE, Skull or VV for PvP. Vastly underrated exotic. With the right build, you get two thirds of your grenade back as long as you hit something with it.