If your looking for a legit strategy to win, but takes much longer I suggest you check out DPJ's video: https://www.youtube.com/watch?v=n1VkdWKKvNc How I did it: https://www.youtube.com/watch?v=FLtV_MQCWo8 Gjallarhorn not really required. What you need is a defender with weapons of light, and a fireborn sunsinger, right when you head out of the airlock have the titan pop thier bubble, unload with rockets, then pop a synth and unload more, ususally it won't be enough to kill him, but he will have one sliver of health left, the warlock needs to kill him before the detainment pop's up, because for some reason I couldn't use radience if killed bu the bubble. When the other 2 die, self-rez and either finish the the boss by yourself, or revive one of your teamates and let them help you, and there you have it.