Sucks in PVP. Too situational to abuse in PVE, if you are waiting for 8-10 enemies to group up everytime before using Nova Bomb you could just use Skull of Dire Ahamkara and run Soul Rip Embrace the Void and Annihilate to have constant Energy Drain and Nova Bomb cooldowns and not wait to use it, people really under estimate it and it works for both PVP and PVE. Everyone loves it but I think Heart of Praxic Fire is better and if you Voidwalk like I do 95% of the time, Skull or Voidfang work fine. I agree Obsidian Minds better for PVE but it's not as good as everyone makes out