A Colossus and an Ogre Walk into a Room
Once you’ve crossed the main bridge that the Taken have retreated over, you’ll enter a huge room with a large, green teleporter. Here you’ll have to slay two mini-bosses, Ta’aun and Baxx. Both of which are incredibly juiced up and considerably cranky.
Ta’aun is a massive Cabal wielding a powerful gatling gun. Focus on him first, move between the boulders on the ground for cover. You’ll notice various Taken will spawn out of the teleporter, as well; you can easily take them out with well-aimed precision shots.
Always be aware where Baxx is; if you get too close, he’ll stomp you into next year. He will also shoot void beams at you, so the boulders that provide cover are crucial.
Just aim at Ta’aun’s head and put the beast down. As long as you stay behind the rocks, he won’t cause too many problems. Once you have executed the Cabal Colossus, focus on taking out Baxx.
For Baxx, just make sure you keep your distance from the Ogre. In his Taken form, he runs much faster than a regular Ogre, but he’s also twice as big so headshots won’t be hard to hit. Just like Ta’aun, your best bet is to take out the minions and then focus on the boss. Just take your time and aim true.
After you’ve executed both mini-bosses, step through the green mist and you’ll come face to face with Oryx, the Taken King.