Atlas

Introduction
The Atlas is the War mode counterpart of the Stryker and packs bigger punch with more HP.

Preparation and summoning
It is recommended to have a large, bumpy arena, although this may ruin performance from you, this will slow down Atlas, as he isn't that good with bumpy arenas. Once done the arena, you must craft the Atlas Clock (Made with 2 tungsten and 5 Iron as well as 2 of each hard mode ore, at a demon altar) and then go to your arena and summon him. You will get the message You feel a Titan coming to your presence... The next 5 seconds, he appears.

Battle (and some tips)
After he arrives, he has a shield, but no HP. He cannot be killed, although his shield can be depleted. After his shield is down, he will fire his Gatling gun against you, dealing 30 damage (with the best War mode gear) directly and indirectly. He fires it somewhat inaccurate. His HP now (once shield is depleted) is 5 million and has 50 defense on head and 5000 defense on body. Once down to 2 million HP, he will charge you and use his "Damage Core" tactical to fire as much rounds from his Gatling gun and try to destroy you with sheer volume of fire, but he has only 15 defense on his head, and 500 defense on his body by now. Once down to 500,000 HP, he will no longer fire his gatling gun, but instead charge over and over. If in the bumpy arena as suggested, he will be unable to dash, and thus avoiding his deadly stomps (Deals 9999 damage even with the best War Mode armor and defense accessories) but he is very able to be weakened by Ichor-based weapons by this stage, as his shield is no more and he only has 250 defense on body and 5 defense on head. Once down to 0 HP, his Pilot ejects and the titan explodes.

Pilot Battle
In this one, well, he's really easy to kill. First, just fire the HVEIAP bullets you found from Stryker, fire a couple from the Carbine Assault Rifle (CAR) and he dies. He has 10 defense and 50 HP. If he ejected too late before the Atlas exploded, he dies with the Atlas.

Drops
Titan's shield (Grants no defense, but enables a shield that acts much like the one used in the Atlas, from Master chief etc) 100%

Kraber-AP Sniper rifle 33.3%

14.5x114mm Ammo (500-1000) 100%

Johnson's Heavy machine gun 33.3%

100 Plat. Coins 100%

Titan Ore (250-5000) 100%

Titan Trophy 100%

Trivia
It is also a reference to Titanfall.

This boss looks like the Atlas titan from Titanfall.

The Heavy Machine Gun it drops is a Gatling gun.