To start this quest, speak with Emily Pope in the board room at the end of the game.
Locate Hiss-corrupted Tommasi
Fast travel to the Transit Corridor in Containment then walk forwards into the Turntable area. If you look to the left, you'll see a huge open door leading to Sterling AWE. This is where you'll find Mr Tommasi, floating around a huge rock.
I won't beat around the bush: This fight is tough. Tommasi is a Hiss Elevated so he tends to dodge most of what you throw at him with Launch. I'd recommend using the Pierce mod for your service weapon because it deals the most damage and is effective at taking down his shield.
When you take him down to about 50% health, some Hiss Charged will spawn. Use Launch on these as they won't dodge your throws, but from now on, you want to stay airborne with Levitate at all times. There's a Hiss Distorted roaming about, which means it's invisible most of the time until it sneaks up on you. It can only deal damage when you're on the ground though, so always try to stay in the air. Keep one eye on Tommasi as much as possible because both Shield and Evade will be vital in dodging his attacks, and you need to dodge everything. Depending on how much health you have at the start of the fight, two or three hits will end you, and there's not much health to regenerate in this fight.
When Tommasi is nearly dead, another smaller wave of enemies will spawn, this time a mixture of Hiss Rangers and Hiss Charged, along with the Hiss Distorted still roaming around if you haven't killed it. Make sure you keep dodging Tommasi's attacks and if you're close to death, even the Rangers can take you out quickly so be careful. Also, when you eventually kill Tommasi, you'll have to finish off all the other enemies too — including the Hiss Distorted — so don't celebrate too quickly until the room is completely clear. When you've completed it, head back to the Board Room to speak with Emily.
Main Missions:
Control walkthrough: Welcome to the Oldest House
Control walkthrough: Unknown Caller
Control walkthrough: Directorial Override
Control walkthrough: Old Boys' Club
Control walkthrough: Threshold
Control walkthrough: My Brother's Keeper
Control walkthrough: The Face of the Enemy
Control walkthrough: Finnish Tango
Control walkthrough: Polaris
Control walkthrough: Take Control
Side Missions:
Control walkthrough: Old Friends
Control walkthrough: Fridge Duty
Control walkthrough: Self-Reflection
Control walkthrough: Mr Tommasi
Control walkthrough: Old Growth
Control walkthrough: A Matter of Time
Control walkthrough: Langston's Runaways
Control walkthrough: The Enemy Within
Control walkthrough: Mold Removal
Control walkthrough: What a Mess (all missions)
