Atrium is the fifth chapter of the second act in Gears of War: Judgment.
As you start the chapter, the Declassified Mission will be right in front of you.
"Kilo Squad claimed to have successfully defended support bot using only pistols."
If you choose to activate the Declassified Mission, you're gonna have to defend your bot with only a Snub Pistol and no other additional guns (Automatic Sentries don't count towards this challenge). It can be really difficult on Hardcore or Insane so plan your strategies carefully.
Drones and Wretches will come down from the balconies and Boomers will come from the front doors. There's an Automatic Sentry at the room. Put it near Troy so that it can protect him. Beware Grenadiers as they'll kill you with one or two shots on higher difficulties. Try headshots and active reloads or wait until you can ambush your enemies but try not going into close quarters because you'll be dead once they down you.
Once you're done, get out of there and you'll find a new weapon called the Tripwire Crossbow. It is similar to the Torque Bow but instead of the arrows instantly exploding, it waits until an enemy comes nearby, much like a mine. Even though you have finished the level, you might want to keep the Crossbow for the next one as you're gonna need it. Walk upstairs until you reach the upper part of the courtyard and you'll have finished the chapter.
Behind the barrier, there'll be two rooms; one to the left and one to the right. The COG Tag is at the room to the right, behind the door and some lockers.
|Gears of War: Judgment Walkthrough|
|Gears of War: Judgment||Act I · Act II · Act III · Act IV · Act V · Act VI · Act VII|
|Act I||Old Town · Riverwalk District · Museum Gardens · Great Hall · Kashkur Wing · East Wing · Archives · Vaults|
|Act II||Enfield Bridge · Courtyard · R&D Labs · Monroe Commons · Atrium · Crash Site|
|Act III||Amador Park · Magadha Villa · Soleno Villa · Windward Way · Risea Estate · Guest Bungalows · Elliott's Mansion|
|Act IV||Fortress · Container Terminal · Motor Pool · The Cliffs · Central Base · Central Control · Beach|
|Act V||Wharf District · Parade Grounds · Upper State Street · State Street Rooftops · First Avenue Rooftops · Museum Square Rooftops · Overlook|
|Act VI||Grand Courtroom · Halls of Judgment · Terrace · North Entrance · Main Entrance · Great Staircase · Plaza for the Tyran Dead|
|Act VII||Reunion · Anybody Home · Dead End · One Step Closer · Straight to the Top · A Few Complaints|