A very dangerous ANMC and one of the most dangerous GOLEMs that Aya will fight, the Knight GOLEM is quite a different beast than the others you have fought up until this point. Their first attack is to grab you from behind and attempt to inject you with a toxic material, which inflicts Poison. They will then turn invisible and attempt to grab you again.
The easiest way of fighting them is to back into the corner and study them carefully. Frequently they will create a hologram which is a silhouette version of the Knight. Do NOT run through this as the real one will appear to grab you. You will know when the real one appears as it has coloration to it and then blast it. It will quickly cloak but you should do enough damage to prevent it from attacking.
When it is going to charge you, you'll see a laser sight. By avoiding this, you can also get some damage in there. When they fall to the ground and can quickly and easily finish them off.