This page in our guide to Control contains the description of the battle with one of the bosses, the Former. Defeat the enemy to get a trophy/achievement with the same name - Former.
Description: The Former is a giant boss with a big eye at top of its body. Pick up items and use Launch to deplete a lot of its health. The boss will throw energy balls at you - avoid or shoot them down from the air using weapons or by throwing objects.
In addition, the Former will use its legs to try to crush you. Besides the fact that these attacks take away a lot of health, they leave a hole in the floor - if you fall into it, you will automatically lose the fight.
You need to be mobile. Use levitation, throw objects at the boss and use a weapon with high fire rate. Do not stay in one place and from time to time look at the ground to know where the holes after hitting the tentacles. A successful throw at the eye of the enemy takes a lot of health so try to be accurate - throws right after the enemy ends its attack, when it stands in place for a moment.