ITS SOLVED. Use all the bombs to activate all the clean rooms. Kill him like normal. Easy More detail. So during the DPS phase bombs drop. Use these bombs to activate two clean rooms. His health should almost be half down. On the second phase don't kill him and use the bombs to activate the other two rooms. You have now activated all four rooms. You can just kill him like normal and boom you've beat it. [u]Loot:[/u] [spoiler]you're going to get a emblem for HM only. An ornament for HM as well. Past that, you have a chance at both siege engine and Vosik drops. They ARE NOT for sure 400 drops, they are still based on your light level and people seem pretty mad about this. [/spoiler] [i] Note* it appears you have to kill him in 3 damage phases. So do it like I said above and use two rooms a phase. Hopefully this helps[/i] Huge tip!!! I had a lot of issues with bombs missing safe rooms to activate them. Simple tip. [spoiler]crouch in front of the door so the animation doesn't throw off your aim. Should help a lot of you [/spoiler] [b]Click if you're a dope person[/b] [spoiler]if this helped you out and if you got some time to kill on the internet, check out my YouTube channel it would mean a lot. https://m.youtube.com/colossusfitness ][/spoiler]