•  Overview - At 60% health, Nitrogg Thundertower retreats to his Assault Cannon at the far end of the train car. Players must reclaim Blackrock Munitions from soldiers that pour into the area, and use them destroy Nitrogg's cannon, after which they may dispatch Nitrogg directly. |
| | •  Damage Dealers - Defeat Grom'kar Boomers to loot  Blackrock Mortar Shells, then enter a Blackrock Turret to heavily damage Nitrogg's Assault Cannon. Take shelter behind an obstacle when targeted by Nitrogg's  Suppressive Fire. |
| | •  Healers - Take shelter behind an obstacle when targeted by Nitrogg's Suppressive Fire. The platform has many tight turns; be aware of your lines of sight to other party members. |
| | •  Tanks - Reinforcements continually enter the encounter area and must be tanked. Take shelter behind an obstacle when targeted by Nitrogg's Suppressive Fire. |
| • Nitrogg Thundertower |
| | • Blackrock Mortar |
| | •  Blackrock Grenade |
| • Assault Cannon |
| | • Suppressive Fire |
| | • Slag Blast |
Blackrock Munitions
Defeated Blackrock weapons specialists will leave behind munitions, which players may picked up and use against Nitrogg and his soldiers. |
| | • Blackrock Shrapnel |
| | | • Shrapnel Cannon |
| | • Blackrock Mortar Shells |
| | | • Artillery Shell |
| | • Blackrock Grenades |
| | | • Blackrock Grenade |
Reinforcements |
| | • Iron Infantry - The Iron Infantry stand as the backbone of the Iron Horde, combating foes with their sharpened axes. |
| | • Grom'kar Gunner - Defeated Grom'kar Gunner will drop Blackrock Shrapnel. |
| | | •  Shoot |
| | • Grom'kar Boomer - Defeated Grom'kar Boomer will drop Blackrock Mortar Shells. |
| | | • Blackrock Mortar |
| | • Grom'kar Grenadier - Defeated Grom'kar Grenadier will drop Blackrock Grenades. |
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