Acrid (Unlisted Miniboss)

Acrid can be found in the top-right area of the Sunken Tombs level in a cage. After activating the crate, it will open, releasing a NPC-controlled, hostile Acrid. He has a good amount of health, but is easy to kill using drones. Once defeated, he willl become playable.

Acrid will only spawn in one of the three layouts of the area, and only during single-player mode; he will not spawn in co-op.