In light of Year 1 exclusives being unlocked for Xbox players like myself, another strike I'd recommend is the Undying Mind strike. Granted, you can only access it from the Heroic strike playlist and might not work if you end up in the Taken version (for reasons I shall explain), but there are a few points in the strike where you can easily complete the last stage of the quest. The reason: The original version has a monstrous number of majors in it several times. The first instance is half-way through when you have to fight your way through an enclosed stairway, with a barrier blocking the path. Immediately in front of this barrier will spawn several major goblins and Minotaurs. Using your nova bomb here will almost certainly generate 7 orbs, and if you happen to have Obsidian Mind and Bad Juju the number of potential bombs here could help you complete the quest immediately. If you could not complete it, for instance if you're in the Taken version, simply press on to the boss fight against the eponymous Hydra. Twice during the fight - regardless of the version you are running through - 2 tightly-packed groups of goblin majors will spawn on opposite ends of the arena; use bombs as needed, and you should be done. Hope this helps :)