Barrier Servitors. One in the first room on the left, and one in the boss room.
Fallen Captains. One in the first room on the far upper cliff, one in the second room up the stairs, and one in the boss room.
The boss is a Fallen Captain with an Arc shield.
Scorched Earth – Enemies throw grenades significantly more often.
In the tripmine section before the boss room, the second mine's blast radius is bigger than you think.