I did it with three 295s a warlock and two titans, you don't need anything at 300+ or an exotic sword, I used the bryonic hero pistol at 289, the next big thing shotgun at 294, and a truth rocket launcher at 297, nobody in my team was over 300 on anything rank or weapons. All you need to do is have one titan with weapons of light taking out the taken black spawn orbs (don't know proper name), another titan with sunbreaker fighting the boss and the warlock making orbs with stormcaller fighting the extras.