The Eyes of the Adversary were a race of humanoid beings that serve the Enchantress.
They are normal humans from Midway City who are somehow turned into bizarrely looking monsters by the Enchantress. Amidst turned are average day people, children and criminals. They are more violent minions completely separated from their human selves and do Enchantress' bidding such as completely overrunning Midway City.
The Eyes of the Adversary almost immediately fight the Task Force X after they presumably shoot down their escort chopper. They are quickly dispatched of; the Squad continues to run into more of them as they progress in their mission, but they are too killed. When Enchantress is finally defeated, the Eyes of the Adversary are no more.
"She takes an average person, a yoga mom, an elderly retiree, and she turns them into a soldier who can take a headshot and still fight. It's an instant army."
The Eyes of the Adversary are very strong (at least on par with Batman), to the point where they can make great leaps, scale walls and even quickly overpower and defeat the US military in battle with relative ease. However, they are notably not as strong as Enchantress or Killer Croc. They also have a degree of superhuman durability (at least on par with Batman), to the point where Amanda Waller says that they "can take a headshot and still fight", through multiple gun wounds will bring them down, as demonstrated in their battle with the Task Force X.
During their time serving as Enchantress' army, the Eyes of the Adversary acquired weapons to fight the military, including assault rifles, knives, sledgehammers, and axes.