On this page of the trophy guide to the game Deathloop, you will find a detailed description of the achievement called Not-So-Invisible Man. From the description below, you will learn how to kill Egor Serling when he influenced by a field nullifier
As a reminder, killing Egor is linked to a lead Lost in Transmission, which walkthrough you will find in our guide. To do this, you have to visit the Complex district in the evening and then choose one of the paths leading to the camp of this Visionary shown in the picture.
You don't have to sneak on the way. Even if Egor expects you to arrive, you can still unlock this achievement.
A very likely scenario is that when you get close to Egor, you will automatically start a fight with him. Don't attack Egor yet - examine the nearby buildings for the suitcase with the field nullifier shown in the picture. It should lie on one of the railings in the open air.
Pick up the suitcase. You need to set up the nullifier, and you can do it anywhere in the camp.
After the nullifier is activated, get out of its range. Wait for an opportunity to attack Egor when the Visionary approaches the nullified. Once he gets within its range, he will lose the ability to use camouflage. If you have problems with "encouraging" Egor to do this, you can use, for example, Aether power to temporarily disappear from his field of vision. Egor should then start searching the area.
As soon as the boss loses his unique power, start attacking him to kill him. A good idea might be to use a shotgun. It will increase the chances that you will be able to eliminate him before he gets beyond the field nullifier range.