This can be completed in Chapter 6. At the end of the chapter, you will come across a massive necromorph. I preferred using Pulse Rifle during first phase (or Rivet Gun will do) and using RG or Flamethrower inside the fans to save ammo for PR. If you can time it, the Line Gun does great damage to the oscillating yellow blob in the third phase, so you can use the LG while waiting for it to toss a blob at you.First phase
- shoot the yellow flesh on the tentacles to avoid them slapping you, and once you move to either side, stasis the fan to move in and continue shooting it; do this twice, one on each side. (*There is an easily missable collectible on the right platform that you can grab before you stasis the fan, or you'll miss it and have to re-play the level for it.
- grab the explosive barrels with kinesis and shoot them at the tentacle once it hits the water and moves forward coming at you; do this twice. If you're grabbed and pulled towards boss, shoot at its mouth to break free.Third phase
- the necromorph will start lobbing explosive bombs at you, so catch them with kinesis and shoot them at the oscillating yellow blob at the base of it. Score 3-5 hits to end the fight.