It absolutely works. I tried getting it via just trying other methods and it wasn't happening. However, some genius on the forums mentioned it but I found no thread on the strategy itself. So here's what you do. Have one defender titan roll with blessing of light. The two other players can be whatever classes they want, I ran with two hunters myself. However, having at least one stormcaller that can wreck adds is great. Having another or a sunbreaker is even better for total destruction of mobs. You can also have two defenders if you want to continuously drop bubbles. All three players MUST have a sword. Exotic swords are even better as their strong attacks can do some serious damage. I believe my Raze-Lighter was doing something crazy like 30k or so damage per uppercut. The way this works is simple. You run up in that punk asses face, drop a bubble down, and proceed to beat him up while inside the safety of the bubble. You'll notice that he's dying VERY quickly. The boss has no instakill AOE move or any kind of heavy hitting melee attack for that matter. He's honestly a wimp once you start smashing him into the wall where you see him spawn. The key is stunlocking him into the wall and making sure he goes no where while you smack the ever-living shit out of him. It should take about the length of an entire bubble to kill him if done correctly. Afterwards, get back and kill all the Taken blights on sight then leisurely kill the adds. DO NOT rush and repeatedly die, you have to remember that every second is precious so don't waste time. Congrats, you now have Black Spindle.