Phase Three
In this final stage, you’ll have the added implications of pink Shepard security robots coming in to aid Methuselah’s titan. While this may seem like bad news at the beginning, these are also your most valuable asset during the last stage of this fight. Keep avoiding the incoming attacks from the titan until you see the Pink robots appear. Vacuum one of the heads off as soon as they appear and start pummeling shots into the titan’s now vulnerable chest section. If you’ve unlocked the upgrade, hold down R2 to charge your shots to whittle away its final third of health even faster.
Of course, you’ll need to keep an eye on your health in this section, so it’ll also help if you’ve picked up the upgrade that allows you to knock a robot’s head off and replace it with your own. This will allow you to quickly switch out of a badly-damaged body, as well as removing some of the Shepard support for the titan at the same time. Keep an eye on the number of Shephards spawning too, it’s easy to get overwhelmed during these last moments and have to start the whole thing over.